scholarly journals Optimized One-Click Development for Topology-Optimized Structures

2021 ◽  
Vol 11 (5) ◽  
pp. 2400
Author(s):  
Tobias Rosnitschek ◽  
Rick Hentschel ◽  
Tobias Siegel ◽  
Claudia Kleinschrodt ◽  
Markus Zimmermann ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Design Space ◽  
Testing Machine ◽  
Smoothing Algorithm ◽  
Test Results ◽  
Hybrid Topology ◽  
Universal Testing ◽  
The One ◽  
Finite Spheres ◽  
Digital Engineering

Topology optimization is a powerful digital engineering tool for the development of lightweight products. Nevertheless, the transition of obtained design proposals into manufacturable parts is still a challenging task. In this article, the development of a freeware framework is shown, which uses a hybrid topology optimization algorithm for stiffness and strength combined with manufacturing constraints based on finite spheres and a two-step smoothing algorithm to design manufacturable prototypes with “one click”. The presented workflow is shown in detail on a rocker, which is “one-click”-optimized and manufactured. These parts were experimentally tested using a universal testing machine. The objective of this article was to investigate the performance of “one-click”-optimized parts in comparison with manually redesigned optimized parts and the initial design space. The test results show that the design proposals created while applying the finite-spheres and two-step smoothing are equal to the manual redesigned parts based on the optimization results, proposing that the “one-click”-development can be used for the fast and direct development and fabrication of prototypes.

Effect Analysis of Temperature on the Rubber Material Stress-Strain Relationship

2014 ◽  
Vol 977 ◽  
pp. 116-119 ◽  
Author(s):  
Yu Liang Yang ◽  
Liang Qiao ◽  
Cong Wang ◽  
Fei Lu ◽  
Xiao Hui Kang
Keyword(s):  
Environmental Temperature ◽  
Testing Machine ◽  
Test Results ◽  
Stress Strain ◽  
Rubber Material ◽  
Effect Analysis ◽  
Universal Testing ◽  
Different Temperatures ◽  
Strain Relationship ◽  
Relationship Of

For the effect of environmental temperature on the rubber material stress-strain relationships, rubber tensile specimens, compression specimens and shear specimens were made. Through the electronic universal testing machine Instron 5500R, the stress-strain curves of three kinds of specimens at different temperatures were obtained. The test results showed that the stress-strain relationship of rubber material was typically nonlinear. As the temperature increased, the elastic modulus of rubber material decreased.

Analysis on the Reasons of 500kV High-Voltage Disconnectors Hoop Fracture

2014 ◽  
Vol 915-916 ◽  
pp. 992-995
Author(s):  
Shuang Liu ◽  
Wei Tan Cui ◽  
Hong Wu Zhang ◽  
Yong Quan Ma
Keyword(s):  
Mechanical Properties ◽  
High Voltage ◽  
Chemical Elements ◽  
Testing Machine ◽  
Optical Microscope ◽  
Test Results ◽  
Tightening Force ◽  
Hardness Tester ◽  
Universal Testing ◽  
Fracture Appearance

The fracture reasons of 500kV high-voltage disconnectors hoops were analyzed. The fracture appearance, composition of chemical elements, metallographic, mechanical properties of the fractured hoops were investigated by ICP-AES, SEM, optical microscope, brinell hardness tester, universal testing machine. The test results that one reason is substandard products of this batch hoop. The composition of chemical elements and mechanical properties is fails to comply with applicable standards prescribed and the casting defects are found. Another reason is that the large pre-tightening force and tightens reverse order.

scholarly journals Effect of black tea on the transverse strength of heat-polymerized acrylic resin

2017 ◽  
Vol 29 (3) ◽  
Author(s):  
Eni Rahmi ◽  
Zulkarnain Agus ◽  
Riezka Hanafiah Putri
Keyword(s):  
Testing Machine ◽  
Acrylic Resin ◽  
Black Tea ◽  
Test Results ◽  
Three Point Bending ◽  
Average Value ◽  
Transverse Strength ◽  
Significant Difference ◽  
Experimental Laboratory ◽  
The One

Introduction: Heat-polymerized acrylic resin is the most basic denture material used. One of the mechanical properties of an acrylic resin is its transverse strength. The transverse strength test provides an overview of the material’s durability in accepting the load at mastication. Consumption of tea, especially black tea in the world placed the second most consumed. The purpose of this study was to determine the effect of black tea on the transverse strength of heat-polymerized acrylic resin. Methods: This research was an experimental laboratory with 24 samples of heat-polymerized acrylic resin plate with the size of 65x10x2.5 mm. The sample was divided into 6 groups, each consisted of 4 samples. The first, second, and the third groups were immersed in aquadest for consecutively 1, 4, and 20 days. The fourth, fifth, and sixth groups were immersed in the black tea for consecutively 1, 4, and 20 days. The transverse strength was tested using the three-point bending method with the Universal Testing Machine. The results of the transverse strength measurement were then analyzed statistically by the One-way ANOVA test and Holm’s sequential Bonferroni posthoc test as an advanced test. Results: The results of the statistical test showed that p<0.05 (p=0.000) which means that the six groups have a significant difference in the average value of the transverse strength. Conclusion: The conclusion of this research was the black tea immersion duration was affecting the transverse strength differences of the heat-polymerized acrylic resin.

Laboratory Testing of Piezoelectric Bridge Transducers for Asphalt Pavement Energy Harvesting

2011 ◽  
Vol 492 ◽  
pp. 172-175 ◽  
Author(s):  
Ling Yao ◽  
Hong Duo Zhao ◽  
Zhan Yu Dong ◽  
Yi Fan Sun ◽  
Yuan Fa Gao
Keyword(s):  
Output Voltage ◽  
Asphalt Pavement ◽  
Testing Machine ◽  
Performance Comparison ◽  
Maximum Output ◽  
Test Results ◽  
Digital Storage ◽  
Distributed Load ◽  
Universal Testing ◽  
Energy Converting

This paper presents the test results of the energy converting efficiency of piezoelectric Bridge transducer for harvesting stress driven energy in asphalt pavement. The arc and the trapezoidal Bridge transducer were made for performance comparison. The Bridge transducers were tested by Universal Testing Machine (UTM) under different frequencies and distributed load. The output voltage was recorded by digital storage oscillograph. 4 groups of data were obtained. The maximum output voltage of 232V was recorded from the arc Bridge transducer in the initial laboratory test, which was conducted under 0.4 MPa with 5 Hz half-sine loads. However, only 106V maximum output voltage was measured from the trapezoidal Bridge transducer under the same load and 154V was measured under 0.7 MPa with 5Hz half-sine loads. The results show the possibility of harvesting energy from pavement. Higher energy converting efficiency of arc Bridge transducer was measured compared to the trapezoidal Bridge transducer.

scholarly journals DESAIN KEMASAN SEKUNDER PADA PRODUK PROL TAPE DENGAN METODE QUALITY FUNCTION DEPLOYMENT (QFD) (Studi Kasus di UD. Purnama Jati, Kabupaten Jember)

2021 ◽  
Vol 15 (01) ◽  
pp. 11
Author(s):  
Ida Bagus Suryaningrat ◽  
Nidya Shara Mahardika ◽  
Mela Eriana Firlanarosa
Keyword(s):  
Compressive Strength ◽  
Quality Function Deployment ◽  
Testing Machine ◽  
Test Results ◽  
Product Packaging ◽  
Quality Function ◽  
Universal Testing ◽  
Compressive Strength Test ◽  
Research Findings ◽  
Qfd Method

Packaging refers to an object to protect and secure certain products within the package as well as giving a particular image to persuade the customers. The research objectives were to identify customers’ desires and satisfaction levels to prol tape product packaging using the quality function deployment (QFD) method, designing packages, determining the type of packaging, and determining the compressive strength of the packaging using a universal testing machine (UTM). The research findings were 4 important attributes found for secondary packaging, namely the attributes of strength, appearance, price, and protection. Based on the attributes, the researcher designed a new secondary packaging using the RSC (regular slotted container) type of packaging consisting of two parts; BC flute type for outer packaging and B flute type for inner packaging. Meanwhile, the old secondary packaging only consisted of one part, namely B flute type for outer packaging. According to the compressive strength test results, the new packaging has a compressive strength value of 189.6 kgf with a maximum stack number of 40 stacks, and the old packaging has a compressive strength value of 82.7 kgf with a maximum stack number of 18 stacks. Keywords: compressive strength, packaging, prol tape, QFD

scholarly journals Assessment of the Flexion Force of TMA and Elgiloy Intrusion Arches to Different Lengths of Activation. An In Vitro Study

2019 ◽  
pp. 209-216
Author(s):  
Francis Kelvin Ramos Lara DDS ◽  
Teresa Evaristo-Chiyong DDS, MSc, PhD
Keyword(s):  
Testing Machine ◽  
In Vitro Study ◽  
Test Results ◽  
Lower Strength ◽  
Universal Testing ◽  
Distal Branch ◽  
Student’S T ◽  
Flexion Force ◽  
Lower Incisors

The present study analyzed the utilitary arch of Ricketts made with TMA and Elgiloy alloys, evaluating the forces that each one presented at different activation lengths. METHODS: A total of 30 arches (15 per alloy) 17x25 caliber were assessed. An acrylic model that simulated the jaw was used with tubes welded to the bands located on the first molars where the arches were attached and brackets were bonded to the lower incisors. The Ricketts arches had a total length of 100 mm and were activated in their distal branch, obtaining the lengths of 5, 10 and 15 mm measured from the slot of the anterior brackets in the midline. A Digital Universal Testing Machine CMT-5L was used to measure the bending force and the statistical analysis was carried out with the Student's T and Mann-Whitney U test. RESULTS: The TMA alloys had a significantly lower strength in each of the activations 5, 10, 15 mm (13,53; 31,61 and 42,01grams respectively) compared to Elgiloy (31.41; 62,61 y 93,00 grams respectively). While increasing the activation length, the flexural forces increased significantly for both alloys. CONCLUSION: The suggested forces for the intrusion of lower incisors were reached by the Elgiloy arches.

scholarly journals Evaluation of shear bond strength of different treatments of ceramic bracket surfaces

2012 ◽  
Vol 17 (4) ◽  
pp. 1-8
Author(s):  
Patrícia Helou Ramos Andrade ◽  
Rogério Vieira Reges ◽  
Marcos Augusto Lenza
Keyword(s):  
Shear Bond Strength ◽  
Composite Resin ◽  
Statistical Tests ◽  
Testing Machine ◽  
Test System ◽  
Test Results ◽  
Universal Testing ◽  
Ceramic Brackets ◽  
Composite Resin Restoration ◽  
Ceramic Bracket

OBJECTIVE: To evaluate the bonding strength of the ceramic bracket and composite resin restoration interface, using four types of treatment on the base of the bracket. METHODOLOGY: 48 photoactivated composite resin discs were used (FiltekTM Z250) contained in specimens and divided into 4 groups of 12 specimens for each group according to the type of treatment performed on the base of the brackets. Once the brackets were bonded, the specimens were subjected to shear stress carried out in a universal testing machine (MTS: 810 Material Test System) calibrated with a fixed speed of 0.5 mm / minute. The values obtained were recorded and compared by means of appropriate statistical tests - analysis of variance and then Tukey's test. RESULTS AND CONCLUSIONS: The surfaces of ceramic brackets conditioned with 10% hydrofluoric acid for 1 minute, followed by aluminum oxide blasting, 50µ, after silane application and primer application, was considered the best method to prepare surfaces of ceramic brackets prior to orthodontic esthetic bonding.

scholarly journals Experimental evaluation of the load capacity of the rollers of gravity conveyors for pallets

2020 ◽  
Vol 1 (3) ◽  
pp. 59-64
Author(s):  
Ye.V. Safronov ◽  
◽  
A.L. Nosko ◽  
Keyword(s):  
Load Capacity ◽  
Testing Machine ◽  
Experimental Studies ◽  
Test Results ◽  
Load Range ◽  
Universal Testing ◽  
Urgent Task ◽  
The Stability ◽  
The Cost ◽  
Roller Support

The main approaches to calculating the load capacity of the carrying rollers of gravity conveyors are presented. It is shown that in practice, in the designs of modern non-driven conveyors for pal-lets, the priority when choosing the pitch of the carrier rollers is the stability of the movement of the load, rather than minimizing the number of rollers. In connection with the urgent task of reducing the metal consumption and the cost of gravity roller conveyors for pallets, the purpose of the work is to experimentally determine the load capacity of the rollers of gravity conveyors for pallets with plastic bearing housings. The experimental studies were carried out in the laboratory of the Depart-ment of Applied Mechanics on a Galdabini Quasar 50 universal testing machine using a special roller support for two roller designs - with a solid axis and on half-axles. The test results showed that the stiffness of a roller with a solid axis in the load range up to 670 N is about 1358.4 N / mm, and in the load range from 670 to 1500 N - 2229.9 N / mm. The rigidity of the roller on the axle shafts in the entire load range is 2048.0 N / mm. The analysis of the obtained results showed that for loads over 670N the use of the axle slightly increases the stiffness coefficient, and, on the contrary, it decreases in the load range up to 670N. In order to reduce the cost of carrying rollers with plastic bearing housings, it is advisable to use a design on semi-axles.

scholarly journals Effect of Different Bonding Strategies on Adhesion to Deep and Superficial Permanent Dentin

2010 ◽  
Vol 04 (02) ◽  
pp. 110-117 ◽  
Author(s):  
Rafael Eduardo Fernandes Pegado ◽  
Flávia Lucisano Botelho do Amaral ◽  
Flávia Martão Flório ◽  
Roberta Tarkany Basting
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Testing Machine ◽  
Adhesive System ◽  
Single Bond ◽  
Adhesive Systems ◽  
Microtensile Bond Strength ◽  
Universal Testing ◽  
One Step ◽  
The One

Objectives: To evaluate the effect of different bonding strategies on the microtensile bond strength to deep and superficial permanent dentin.Methods: Forty-eight teeth were randomly flattened according to the dentin depth: superficial dentin (SD) and deep dentin (DD). Subsequently, three adhesive systems were applied (n=8): an etchand- rinse (Adper Single Bond 2 - SB), a “mild” two-step self-etching (Clearfil SE Bond - SE) and a one-step self-etching adhesive system (Futurabond – FB). Each specimen was restored with a composite resin and sectioned into 1.0-mm2 thick slabs. After 24 hours, resin-dentin sticks were submitted to tensile stress in a universal testing machine (0.5 mm/min). Data were submitted to two-way ANOVA and Tukey’s test at a level of 0.05%.Results: Superficial dentin showed the highest microtensile bond strength values, which differed statistically from those obtained in the deep dentin, irrespective of the adhesive system used. FB yielded the highest bond strength values, which were statistically similar to the bond strength values of SE, but statistically different from those obtained when the SB adhesive was used.Conclusions: Bond strength obtained in superficial dentin was significantly higher than in deep dentin, for all adhesive systems tested. Adhesion was affected by the different bonding strategies: the one-step, low pH, acetone-based self-etching adhesive promoted the higher bond strength values, which were statistically similar to those obtained with the two-step, water-based self-etching adhesive. (Eur J Dent 2010;4:110-117)

An adjustable bearing seat stiffness element for targeted vibration influencing

2021 ◽  
Vol 263 (6) ◽  
pp. 757-766
Author(s):  
Carolin Sturm ◽  
Andreas Lindenmann ◽  
Thomas Gwosch ◽  
Sven Matthiesen
Keyword(s):  
Dynamic System ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Design Space ◽  
Testing Machine ◽  
Technical System ◽  
System Behavior ◽  
Load Range ◽  
Theoretical Approaches ◽  
Universal Testing

In order to be able to influence the dynamic system behavior in a targeted manner, parameters such as stiffness in the technical system must be adjustable. In high-speed powertrains, the stiffness of the bearing seat, in particular, has an influence on the dynamic characteristics. As part of our research, we developed an adjustable bearing seat stiffness element. The focus of research was on an adjustable, scalable element with a small design space and the same properties over the perimeter. We characterized it statically with the help of a universal testing machine and dynamically using a shaker system. The results are compared with theoretical approaches. The results show that the stiffness is almost linearly adjustable in the load range of 0-100N. The results indicate that the developed element can be used to adjust desired stiffness and thus to influence vibrations in a targeted manner. The findings can be used in the design of high-speed powertrains e.g. in serial products or test benches.

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