scholarly journals Experimental Research on Behaviour of 3D Printed Gripper Soft Jaws

2021 ◽  
Vol 57 (4) ◽  
pp. 366-375
Author(s):  
Dragos-Florin Chitariu ◽  
Emilian Paduraru ◽  
Gures Dogan ◽  
Mehmet Ilhan ◽  
Florin Negoescu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Energy ◽  
Test Sample ◽  
Displacement Transducer ◽  
Force Transducer ◽  
Standard Test ◽  
Element Analysis ◽  
Experimental Stand ◽  
3D Printed

In this paper, the problem of the behaviour of soft jaws that can be used to replace the steel jaws of grippers is studied. One of the advantages of additive manufacturing is the printing of fully functional parts. Choice of material is often related to the part strength. The mechanical properties of 3D printed parts should meet the service loading and, also, must be comparable with parts produced by traditional manufacturing techniques - machined parts or injection moulding. From the specialized literature information regarding the test results for effect of various printing parameters on part strength are available made in laboratory conditions and for standard test sample. For ABS materials various values for Young module are presented varying from 1.5 GPa to 2.15 GPa, for 100% infill rate and various modified parameters such as raster orientation. In order to study the behaviour of soft gripper jaws several part were printing and the resistance to bending was tested, by simulating the way a gripper works. An experimental stand was built using a force transducer and a displacement transducer to measure the deformation of the jaw, obtained by 3D printing, under load. The mechanical elastic hysteresis loop during an experimental loading/unloading was plotted and the amount of mechanical energy lost during a cycle, dissipated because the internal friction, was determined. Finite element analysis method was applied to make a comparison with the experimental results. In the finite element analysis, several simulations were considered, varying Young s modulus for the tested material.

Finite element analysis of bone and implant stresses for customized 3D-printed orthopaedic implants in fracture fixation

2020 ◽  
Vol 58 (5) ◽  
pp. 921-931 ◽  
Author(s):  
Lina Yan ◽  
Joel Louis Lim ◽  
Jun Wei Lee ◽  
Clement Shi Hao Tia ◽  
Gavin Kane O’Neill ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fracture Fixation ◽  
Orthopaedic Implants ◽  
Element Analysis ◽  
3D Printed

Distortion Measurement of Ship Blocks Using Photogrammetry

2014 ◽  
Vol 30 (02) ◽  
pp. 58-65
Author(s):  
N. R. Mandal ◽  
Sharat Kumar ◽  
Pankaj Biswas
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Test Sample ◽  
Thermomechanical Analysis ◽  
Shop Floor ◽  
Great Promise ◽  
Element Analysis ◽  
Actual Measurement ◽  
Explicit Finite Element ◽  
Large Structures

Welding being a transient phenomenon, explicit finite element thermomechanical analysis of large structural units is computationally extremely time-consuming and in general not feasible. Computational methods are available; however, they need to be validated with full-scale shop floor measured data. As of now, it is extremely difficult to do measurements and acquire some tangible data in actual shop floor situation. In the present work, a method was proposed to actually get the dimensions of such large structures through the use of multiple digital photographs of the structure. The photographs were then processed through a software to get to the dimensions of the threedimensional structure. For validating this method of measurement, two test cases were undertaken. First was using a flat surface plate measuring 3.3 m ×1.3 m over which black dots were pasted at predetermined positions. The distances between the dots were measured using a laser distance meter and compared with those obtained through photogrammetry. In the second case, a test sample was fabricated using a 500 m × 500 mm, 8-mm thick mild steel plate and two longitudinal and one transverse stiffener of 75 × 50 × 6 angle sections. Photographs were taken both before and after welding of the stiffeners. This set of photographs was processed to obtain the resulting deformation of the plate resulting from welding of the stiffeners. The distortion obtained through photogrammetry was compared with the distortion shape of the welded panel obtained from finite element analysis using an average plastic strain method. In both cases, the results of photogrammetry compared fairly well with those of laser distance meter measurements and finite element analysis. The proposed method shows great promise toward actual measurement of large blocks of ship structures and thereby satisfactorily validating theoretical methods of distortion prediction of such large structures.

Bolted Flanged Joint Creep/Relaxation Results at High Temperatures

2014 ◽  
Author(s):  
J. Adin Mann ◽  
Jeremy Hilsabeck ◽  
Cale Mckoon ◽  
Courtnee Jackson
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Control Valve ◽  
Test Sample ◽  
Element Analysis ◽  
Pipe Section ◽  
Before And After ◽  
Fea Simulation ◽  
Fea Analysis ◽  
Spiral Wound

An ASME Class 300 NPS12 flange connection between a control valve and a pipe has been evaluated at a temperature of 1100° F with testing and Finite Element Analysis (FEA). The goal of the testing was to validate the FEA simulation. The valve side of the test sample was a cast structure, the pipe side was a forged flange butt welded to a pipe section, and the gasket was a Thermiculite filled spiral wound gasket. The valve, flange, and piping material are SA-217, SA-182, and SA-335 (2 ¼ Cr – 1 Mo) steel respectively. The bolt length and flange geometry was measured before and after loading the bolts, and before and after heating the sample in order to measure changes in the bolt load and flange rotation which would indicate creep/relaxation in the joint. Tests were run with two types of bolts, B16 (SA-193) and 718 (SB-637), and also with two gasket arrangements, no gasket and then a spiral wound gasket. The results of the completed test and the correlation to an FEA analysis will be presented.

Modeling Alkali-Silica Reaction Using Image Analysis and Finite Element Analysis

2011 ◽  
Vol 250-253 ◽  
pp. 1050-1053
Author(s):  
Jun Ho Shin ◽  
Nam Yong Jee ◽  
Leslie J. Struble ◽  
R. James Kirkpatrick
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Response ◽  
Standard Test ◽  
Alkali Silica Reaction ◽  
Element Analysis ◽  
Finite Element Program ◽  
The Finite Element Analysis ◽  
Element Program ◽  
Element Approach

The objective of this study is to develop a numerical model based on microstructural images of concrete and fundamental material properties of each constituent of concrete subjected to alkali-silica reaction (ASR). A microstructure-based finite element approach is employed directly to analyze the mechanical response of concrete to ASR. The modeling work involves acquiring and processing of microstructural images of specimens suffering from ASR using scanning electron microscopy, and implementing finite element program to analyze the microstructural images. The formulation of this model is based on pressure caused by the ASR product and on properties such as Young’s modulus and Poisson’s ratio. The finite element analysis program used to simulate structural behavior of structures attacked by ASR is object-oriented finite element developed at National Institute of Standards and Technology. The numerical results from this model are compared with experimental data, which have been measured using ASTM standard test C1260. The results show that the development and widening of cracks by formation and swelling of ASR gel cause the majority of expansion of mortar specimens rather than elastic elongation due to gel swelling.

scholarly journals Design Concepts of Polycarbonate-Based Intervertebral Lumbar Cages: Finite Element Analysis and Compression Testing

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
J. Obedt Figueroa-Cavazos ◽  
Eduardo Flores-Villalba ◽  
José A. Diaz-Elizondo ◽  
Oscar Martínez-Romero ◽  
Ciro A. Rodríguez ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compression Testing ◽  
Patient Specific ◽  
Compressive Yield Strength ◽  
Element Analysis ◽  
Testing Conditions ◽  
Design Concepts ◽  
3D Printed ◽  
Manufacturing Parameters

This work explores the viability of 3D printed intervertebral lumbar cages based on biocompatible polycarbonate (PC-ISO® material). Several design concepts are proposed for the generation of patient-specific intervertebral lumbar cages. The 3D printed material achieved compressive yield strength of 55 MPa under a specific combination of manufacturing parameters. The literature recommends a reference load of 4,000 N for design of intervertebral lumbar cages. Under compression testing conditions, the proposed design concepts withstand between 7,500 and 10,000 N of load before showing yielding. Although some stress concentration regions were found during analysis, the overall viability of the proposed design concepts was validated.

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