scholarly journals Dynamic impact testing on post-tensioned steel rectangular hollow sections; An investigation into the “compression-softening” effect

2015 ◽  
Vol 355 ◽  
pp. 246-263 ◽  
Author(s):  
Darragh Noble ◽  
Maria Nogal ◽  
Alan O׳Connor ◽  
Vikram Pakrashi
Keyword(s):  
Impact Testing ◽  
Dynamic Impact ◽  
Softening Effect ◽  
Post Tensioned

Dynamic Impact Testing of Polyurethane Energy Absorbing (EA) Foams

1994 ◽  
Author(s):  
David F. Sounik ◽  
Dennis W. McCullough ◽  
John L. Clemons ◽  
John L. Liddle
Keyword(s):  
Impact Testing ◽  
Dynamic Impact ◽  
Energy Absorbing

scholarly journals Comparison of Lifetime of the PVD Coatings in Laboratory Dynamic Impact Test and Industrial Fine Blanking Process

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2154
Author(s):  
Josef Daniel ◽  
Radek Žemlička ◽  
Jan Grossman ◽  
Andreas Lümkemann ◽  
Peter Tapp ◽  
...  
Keyword(s):  
Impact Test ◽  
Impact Load ◽  
Protective Coatings ◽  
Impact Testing ◽  
Pvd Coatings ◽  
Dynamic Impact ◽  
Repeated Impact ◽  
Suitable Alternative ◽  
Fine Blanking ◽  
Blanking Process

Protective hard PVD coatings are used to improve the endurance of the tools exposed to repeated impact load, e.g., fine blanking punches. During the fine blanking process, a coated punch repeatedly impacts sheet metal. Thus, the coating which protects the punch surface is exposed to the dynamic impact load. On the other hand, the laboratory method of dynamic impact testing is well known and used for the development and optimization of protective coatings. This paper is focused on the comparison of tool life and lifetime of the industrial prepared PVD coatings exposed to repeated dynamic impact load in the industrial fine blanking process and the laboratory dynamic impact testing. Three different types of protective coatings were tested and the results were discussed. It was shown that the lifetime of coated specimens in both the fine blanking and the dynamic impact processes was influenced by similar mechanical properties of the protective coatings. The qualitative comparison shows that the lifetime obtained by the dynamic impact test was the same as the lifetime obtained by the industrial fine blanking process. The laboratory impact test appears to be a suitable alternative for the optimisation and development of protective PVD coatings for punches used in the industrial fine blanking process.

scholarly journals Dynamic impact testing of cellular solids and lattice structures: Application of two-sided direct impact Hopkinson bar

2021 ◽  
Vol 148 ◽  
pp. 103767
Author(s):  
Tomáš Fíla ◽  
Petr Koudelka ◽  
Jan Falta ◽  
Petr Zlámal ◽  
Václav Rada ◽  
...  
Keyword(s):  
Hopkinson Bar ◽  
Impact Testing ◽  
Lattice Structures ◽  
Cellular Solids ◽  
Direct Impact ◽  
Dynamic Impact

scholarly journals A tool for the evaluation of human lower arm injury: approach, experimental validation and application to safe robotics

Robotica ◽  
2015 ◽  
Vol 34 (11) ◽  
pp. 2499-2515 ◽  
Author(s):  
B. Povse ◽  
S. Haddadin ◽  
R. Belder ◽  
D. Koritnik ◽  
T. Bajd
Keyword(s):  
Mathematical Model ◽  
Experimental Validation ◽  
Human Impacts ◽  
Industrial Robot ◽  
Impact Testing ◽  
Impact Response ◽  
Dynamic Impact ◽  
Good Consistency ◽  
Impact Experiments ◽  
Human Injury

SUMMARYThis paper treats the systematic injury analysis of lower arm robot–human impacts. For this purpose, a passive mechanical lower arm (PMLA) was developed that mimics the human impact response and is suitable for systematic impact testing and prediction of mild contusions and lacerations. A mathematical model of the passive human lower arm is adopted to the control of the PMLA. Its biofidelity is verified by a number of comparative impact experiments with the PMLA and a human volunteer. The respective dynamic impact responses show very good consistency and support the fact that the developed device may serve as a human substitute in safety analysis for the described conditions. The collision tests were performed with two different robots: the DLR Lightweight Robot III (LWR-III) and the EPSON PS3L industrial robot. The data acquired in the PMLA impact experiments were used to encapsulate the results in a robot independent safety curve, taking into account robot's reflected inertia, velocity and impact geometry. Safety curves define the velocity boundaries on robot motions based on the instantaneous manipulator dynamics and possible human injury due to unforeseen impacts.

scholarly journals DYNAMIC IMPACT WEAR AND IMPACT RESISTANCE OF W-B-C COATINGS

2020 ◽  
Vol 27 ◽  
pp. 37-41
Author(s):  
Josef Daniel ◽  
Jan Grossman ◽  
Vilma Buršíková ◽  
Lukáš Zábranský ◽  
Pavel Souček ◽  
...  
Keyword(s):  
Impact Test ◽  
Impact Load ◽  
Protective Coatings ◽  
Impact Resistance ◽  
Impact Testing ◽  
The Novel ◽  
Test Results ◽  
Dynamic Impact ◽  
Impact Deformation ◽  
The Impact

Coated components used in industry are often exposed to repetitive dynamic impact load. The dynamic impact test is a suitable method for the study of thin protective coatings under such conditions. Aim of this paper is to describe the method of dynamic impact testing and the novel concepts of evaluation of the impact test results, such as the impact resistance and the impact deformation rate. All of the presented results were obtained by testing two W-B-C coatings with different C/W ratio. Different impact test results are discussed with respect to the coatings microstructure, the chemical and phase composition, and the mechanical properties. It is shown that coating adhesion to the HSS substrate played a crucial role in the coatings’ impact lifetime.

Influence of Carburization on Mechanical Behaviors of NiTiCu Alloy under Dynamic Impact Loading

2007 ◽  
Vol 546-549 ◽  
pp. 2233-2236
Author(s):  
Ren Bo Xu ◽  
Li Shan Cui ◽  
Yan Jun Zheng
Keyword(s):  
Contact Force ◽  
Impact Loading ◽  
Processing System ◽  
Impact Testing ◽  
Mechanical Behaviors ◽  
Absorbed Energy ◽  
Dynamic Impact ◽  
Signal Processing System ◽  
Impact Process ◽  
Dynamic Impact Loading

The mechanical behaviors of bare and carburized NiTiCu specimens under dynamic impact loading were investigated using a home-built impact testing system. The contact force was measured with piezoelectric force sensor and digital signal processing system in real time during impact process. Predicted instantaneous velocity and displacement formula were presented. The results show that the maximum deformation depth of carburized specimens was less than that of bare specimens, and the carburization process can increase absorbed energy and cushion effect to impact of specimens during impact process. The decrease of deformation depth and increase of absorbed energy can reduce the contact force and materials damage of specimens during impact process.

A Set of Constitutive Models for a Kind of Corn Straw Fiber Based Composite Cushioning Packaging Material

2010 ◽  
Vol 174 ◽  
pp. 513-516
Author(s):  
De Gao ◽  
Yu Wang ◽  
Zhuang Liu
Keyword(s):  
Shape Function ◽  
Constitutive Models ◽  
Strain Ratio ◽  
Packaging Material ◽  
Impact Testing ◽  
Corn Straw ◽  
Dynamic Impact ◽  
Material Density ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

A static compressive model and a dynamic compressive model have been constructed based on Sherwood-Frost’s constitutive model for a corn straw fiber reinforced composite cushioning packaging material. In deriving the models, material density, shape function, strain and strain ratio are considered. The validity of models has been verified by static compressive and dynamic impact testing. The proposed models will provide important theoretic guideline for designing this kind of cushioning material.

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