scholarly journals Numerical study for determination of pulse shaping design variables in SHPB apparatus

2013 ◽  
Vol 61 (2) ◽  
pp. 459-466 ◽  
Author(s):  
P. Baranowski ◽  
J. Malachowski ◽  
R. Gieleta ◽  
K. Damaziak ◽  
L. Mazurkiewicz ◽  
...  
Keyword(s):  
Pulse Shaping ◽  
Split Hopkinson Pressure Bar ◽  
Numerical Study ◽  
Experimental Tests ◽  
Peak Shape ◽  
Hopkinson Pressure Bar ◽  
Design Variables ◽  
Split Hopkinson ◽  
Pulse Peak ◽  
Pressure Bar

Abstract High strain rate experimental tests are essential in a development process of materials under strongly dynamic conditions. For such a dynamic loading the Split Hopkinson Pressure Bar (SHPB) has been widely used to investigate dynamic behaviour of various materials. It was found that for different materials various shapes of a generated wave are desired. This paper presents a parametric study of Split Hopkinson Pressure Bar in order to find striker’s design variables, which influence the pulse peak shape in the incident bar. With experimental data given it was possible to verify the developed numerical model, which was used for presented investigations. Dynamic numerical simulations were performed using explicit LS-Dyna code with a quasi-optimization process carried out using LS-Opt software in order to find striker’s design variables, which influence the pulse peak shape.

scholarly journals NUMERICAL MODELLING OF WAVE SHAPES DURING SHPB MEASUREMENT

2019 ◽  
Vol 25 ◽  
pp. 25-31
Author(s):  
Radim Dvořák ◽  
Petr Koudelka ◽  
Tomáš Fíla
Keyword(s):  
Parametric Analysis ◽  
Pulse Shaping ◽  
Split Hopkinson Pressure Bar ◽  
Sensitivity Study ◽  
Hopkinson Pressure Bar ◽  
Pulse Shaper ◽  
Geometric Properties ◽  
Element Size ◽  
Split Hopkinson ◽  
Pressure Bar

The paper aims at the numerical simulation of the wave propagation in compressive Split Hopkinson Pressure Bar (SHPB) experiment. The paper deals with principles of SHPB measurement, optimisation of a numerical model and techniques of pulse shaping. The parametric model of the typical SHPB configuration developed for LS-DYNA environment is introduced and optimised (in terms of element size and distribution) using the sensitivity study. Then, a parametric analysis of a geometric properties of the pulse shaper is carried out to reveal their influence on a shape of the incident pulse. The analysis is algorithmized including the pre- and post-processing routines to enable automated processing of numerical results and comparison with the experimental data. Results of the parametric analysis and the influence of geometric properties of the pulse shaper (diameter, length) on the incident wave are demonstrated.

The Mechanics of Dynamic Fiber Push-Out: Experimental and Numerical Study

2001 ◽  
Author(s):  
John Lambros ◽  
Xiaopeng Bi ◽  
Philippe H. Geubelle
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Numerical Study ◽  
Fiber Composite ◽  
Failure Process ◽  
Hopkinson Pressure Bar ◽  
Composite Systems ◽  
Initiation And Propagation ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Push Out

Abstract This paper summarizes our recent progress on the experimental and numerical study of dynamic debonding and frictional push-out in composite systems. A modified split Hopkinson pressure bar system is adopted to perform dynamic fiber push-out experiments on model single fiber composite systems. A cohesive/volumetric finite element scheme is developed to capture the initiation and propagation of the crack along the fiber/matrix interface. Interface properties are extracted by comparison between experimental and numerical results. Effects of loading rate and surface roughness are presented. The results indicate that the combination of the experimental and numerical analysis constitutes a valuable tool to study the failure process in composites under high loading rates.

Numerical Study of Round-Robin Tests on the Split Hopkinson Pressure Bar Technique

2013 ◽  
Vol 535-536 ◽  
pp. 518-521 ◽  
Author(s):  
Muhammad A. Kariem ◽  
Dong Ruan ◽  
John H. Beynon
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Numerical Study ◽  
High Strength ◽  
Round Robin ◽  
Hopkinson Pressure Bar ◽  
Element Analysis ◽  
Acceptable Error ◽  
Aisi 4140 ◽  
Split Hopkinson ◽  
Pressure Bar

It is known that the split Hopkinson pressure bar (SHPB) technique has not been standardised yet. The standardised SHPB technique is necessary in order to provide guidelines for determining the intrinsic material properties. This paper examines whether consistent results can be achieved from various sets of SHPBs. Finite element analysis has been conducted using ANSYS/LS-DYNA. Numerical simulation of the round-robin tests was conducted to study the consistency of results for OFHC copper, which were obtained from three sets of apparatus, namely: 12.7 mm diameter SHPB made from the AISI 4140 steel, 13 mm diameter SHPB made from the high strength steel (HSS) and 14.5 mm diameter SHPB made from maraging steel 350 (AISI 18Ni). The current study shows that consistent flow stresses (within an acceptable error of 2.5%) were obtained from those three sets of SHPBs, which indicates the possibility of SHPB standardisation in the future.

scholarly journals Experimental and Numerical Study on the Behavior of Dyneema� HB26 Composite in Compression

2019 ◽  
Vol 57 (2) ◽  
pp. 113-122
Author(s):  
Florina Bucur ◽  
Adrian Rotariu ◽  
Liviu Matache ◽  
Florin Baciu ◽  
Gabriel Jiga ◽  
...  
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Numerical Study ◽  
Low Cost ◽  
Testing Machine ◽  
Compressive Load ◽  
High Strength ◽  
Experimental Tests ◽  
Hopkinson Pressure Bar ◽  
Course Of Action ◽  
Pressure Bar

In the last decades as the need for high economical and technical efficiency items/applications became acute, lightweight, high strength and low-cost materials development and investigation emerged as a logical and promising course of action. With high potential for both military and civil sector, the ultra-high molecular weight polyethylene (UHMWPE) is considered a new class of material. Among this class, the Dyneema� HB26 composite is of most interest for the present study. The present paper focuses on the static and dynamic investigation of the HB26 mechanical behavior experiencing an out of plane compressive load. For experimental purposes, using a 15 mm thickness panel two types of samples (cylindrical and cubic samples) were processed. For compression test Instron Testing Machine and the Split Hopkinson Pressure Bar (SHPB) were used. The experimental tests were then compared against the numerical findings highlighting a good consistency.

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