scholarly journals Evaluation of Hugoniot parameters for unreacted Al/PTFE reactive materials by modified SHPB test

AIP Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 045211 ◽  
Author(s):  
Jianguang Xiao ◽  
Zhao Wang ◽  
Zhengyuan Nie ◽  
Enling Tang ◽  
Xuepeng Zhang
Keyword(s):  
Reactive Materials ◽  
Shpb Test

Meso-Scale Experimental & Numerical Studies for Predicting Macro-scale Performance of Advanced Reactive Materials (ARMs)

2015 ◽  
Author(s):  
Naresh Thadhani ◽  
Arun Gokhale ◽  
Jason Quenneville ◽  
Jennifer Breidenich ◽  
Manny Gonzales ◽  
...  
Keyword(s):  
Reactive Materials ◽  
Numerical Studies ◽  
Macro Scale ◽  
Meso Scale

scholarly journals Research on the reaction temperature of PTFE/Al reactive materials

2021 ◽  
Vol 804 (4) ◽  
pp. 042049
Author(s):  
Xuan Zou ◽  
Jingyuan Zhou ◽  
Xianwen Ran ◽  
Yiting Wu ◽  
Ping Liu ◽  
...  
Keyword(s):  
Reaction Temperature ◽  
Reactive Materials

scholarly journals Towards Standardising SHPB Testing - A Round Robin Exercise

2018 ◽  
Vol 183 ◽  
pp. 02027
Author(s):  
Reuben Govender ◽  
Muhammad Kariem ◽  
Dong Ruan ◽  
Rafael Santiago ◽  
Dong Wei Shu ◽  
...  
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Pure Copper ◽  
Round Robin ◽  
Standard Test ◽  
Test Method ◽  
Hopkinson Pressure Bar ◽  
Test Procedures ◽  
Draft Standard ◽  
Shpb Test ◽  
Pressure Bar

The Split Hopkinson Pressure Bar (SHPB) test, while widely utilised for high strain rate tests, has yet to be standardised. As an exploratory step towards developing a standard test method or protocol, a Round Robin test series has been conducted between four institutions: (i) Swinburne University of Technology, Australia (ii) University of São Paulo, Brazil, (iii) University of Cape Town, South African and (iv) Nanyang Technological University, Singapore. Each institution prepared specimens from a metallic material, and provided batches of specimens from their chosen material to the other institutions. The materials utilised in this round of testing were commercially pure copper and aluminium, magnesium alloy and stainless steel (316 grade). The intent of the first exercise is to establish the consistency of SHPB test results on nominally identical specimens at comparable elevated strain rates, conducted by different laboratories following notionally similar test procedures with some freedom in data processing. This paper presents and compares the results of the first batch of tests for copper, identifying variations between results from different laboratories. The variation between different laboratories’ results for copper is suffciently small that there is confidence in the potential to develop a draft standard in future.

Screening reactive materials as permeable barriers to treat lead and benzene contaminated groundwater

2015 ◽  
Vol 15 (3) ◽  
pp. 632-641 ◽  
Author(s):  
Franklin Obiri-Nyarko ◽  
Jolanta Kwiatkowska-Malina ◽  
Tomasz Kasela
Keyword(s):  
Brown Coal ◽  
Diatomaceous Earth ◽  
Deionized Water ◽  
Contaminated Groundwater ◽  
Contaminant Removal ◽  
Batch Experiments ◽  
Reactive Materials ◽  
Exchangeable Fraction ◽  
Permeable Barriers ◽  
Removal Efficiencies

Laboratory batch experiments were performed to: (i) select two individual and two mixtures of potential reactive materials for permeable barriers to treat groundwater contaminated with benzene and soluble lead (Pb2+); (ii) investigate the involved contaminant removal mechanisms; and (iii) determine the permeability and assess the environmental compatibility of the selected materials. Five individual reactive materials (zeolite, diatomaceous earth, brown coal, compost, and zero-valent iron as control) and four mixtures (compost:brown coal, compost:zeolite, compost:mulch, and mulch:diatomaceous earth) in different ratios were investigated. Benzene and Pb2+ were investigated separately using Pb2+/benzene spiked deionized water. Zeolite and brown coal were selected as individual materials for Pb and benzene based on their removal efficiencies. For the material mixtures, compost:brown coal (1:3) and compost:zeolite mixtures (1:3) were selected for Pb, whereas compost:zeolite (1:1) and compost:brown coal (1:5) were selected for benzene. The sequential extraction of Pb from these selected reactive materials showed that Pb was held mainly in the exchangeable fraction (52%–76%). Benzene was removed by biodegradation and sorption, with the latter contributing most to its removal (60%–99%). The selected materials were compatible with the environment considering the amounts of toxic metals leached from them, and their permeabilities were in the range of 4.2 × 10−5–2.14 × 10−3 m s−1.

Analysis of Metallic Materials Behavior during Severe Loadings Using a FE Modeling of the SHPB Test Based on a Numerical Calibration of Elastic Strains with Respect to the Raw Measurements and on the Inverse Analysis Principle

2013 ◽  
Vol 554-557 ◽  
pp. 1133-1146 ◽  
Author(s):  
Adinel Gavrus ◽  
Florina Bucur ◽  
Adrian Rotariu ◽  
Sorin Cănănău
Keyword(s):  
Finite Element ◽  
Inverse Analysis ◽  
High Speed ◽  
Constitutive Behavior ◽  
Metallic Materials ◽  
Strain And Strain Rate ◽  
Analysis Strategy ◽  
Shpb Test ◽  
Materials Behavior ◽  
Elastic Strains

The complex loading paths of non-conventional or rapid forging processes, especially as regards the important gradients of the plastic strain and strain rate characterizing the material deformation, require a reliable knowledge of the rheological constitutive equations. Some recent studies propose adequate phenomenological formulations taking into account the corresponding local physical mechanisms and the sensitivity of the true stress with respect to all mechanical variables. At the same time important scientific efforts have been focused in order to identify correctly all the constitutive law parameters, using adequate mechanical tests and robust numerical tools based generally on the inverse analysis principle. It is known that this new method requires building of a rigorous and adequate experimental space, using data obtained from loading conditions close to the industrial forming process. Then to explore high variations of plastic strain and strain rate, one of the most suitable tests are based on high speed hydraulically press and on the Split Hopkinson Pressure Bars test (SHPB). Consequently this paper propose to improve the experimental data accuracy obtained from the SHPB device by using finite element simulations of the entire high speed mechanical experiment together with the description of the inverse analysis strategy applied in order to analyze the thermo-mechanical constitutive behavior of metallic materials behavior and to identify the corresponding rheological parameters. The first part of this study will be dedicated to a short description of the experimental SHPB test analysis and to the analysis of the measurement data which can be used to describe the real mechanical loadings of the specimen. A new experimental calibration method of the acquisition signals, based on the finite element modeling of the elastic bars deformation during an impact without specimen, will be detailed. Using ABAQUS and CAST3M software, this method is validated from the comparison of the elastic strains variation obtained by the numerical simulations. In a second part will be detailed the inverse analysis strategy together with a real application concerning the rheological behavior of an aluminum alloy using a “dumbbell” specimen during a high speed upsetting test starting from a proposed constitutive relationship. Finally, special “cap” geometries of the material sample will be analyzed during a SHPB compression test in order to understand the feasibility of the proposed method to expand the material constitutive behavior identification to severe loadings. It is then shown the capacity to describe deformation path close to the rapid manufacturing processes and high speed machining.

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