Abstract Glass-fiber reinforced polypropylene (PP) and polybutene-1 (PB-1) materials were investigated in a high-speed tensile test. The glass-fiber content of the materials and the strain rate were varied in the range between 0 and 40 wt.-% and 0.007 and 174 s −1 , respectively. The aim of the investigations was to show in which way the glass-fiber content, and especially the strain rate, influence the material behavior, in this case the stress–strain behavior, the tensile strength and the fracture appearance. The strain-rate dependent material behavior is described with the phenomenological G'Sell–Jonas model. It was found that a transition from isothermal to adiabatic behavior occurs and, therefore, two different regression parameter sets are necessary to describe the material behavior accurately. An increase of tensile strength could be found for the PP and PB-1 materials examined with increasing strain rate. This behavior is described in the literature as positive strain-rate dependence.
Abstract Dynamic tensile tests were carried out using a servo-hydraulic machine on four representative plastic materials following a practice guideline by the Society of Automotive Engineers (SAE). The experimental results generated this way were ranked as “good” using the qualitative measure provided in the guideline. To advance our understanding of dynamic tensile tests, the validity of the dynamic tensile tests was investigated by examining the condition of dynamic stress equilibrium; a crite...
The intention of this paper is to give a comparative review of material models for polymers with special focus on crashworthiness analysis. An outline of polymers classified as incompressible elastomers, compressible foams and thermoplastics is shown. Elastomers and recoverable foams are based on the same theoretical description: hyperelasticity. We present a material law that allows fast generation of input data based on uniaxial static and dynamic tensile tests at different strain rates. For t...
This work presents results of tensile testing of advanced high strength steels of interest for crashworthy structures: Dual-Phase and TRIP (Transformation Induced Plasticity) steels. The improvements in vehicle crashworthiness observed in recent years have been closely linked to advanced high-strength steels that are currently being produced or in process of development. Amongst these, Dual-Phase and TRIP steels have presented excellent properties for use in crashworthy structures. For these ste...
Abstract The flow behaviour and ductility of the Aluminium alloy AA7075, Magnesium alloy AZ80, and Titanium alloy Ti–6Al–4V are investigated in quasistatic and dynamic uniaxial compression and tension tests at nominal strain rates range of 0.001 s - 1 ⩽ e ˙ ⩽ 5000 s - 1 and temperatures between 20 and 450 °C. Shear tests using hat-shaped specimens are carried out by quasistatic and dynamic loading at shear rates ranging between 0.01 s - 1 and 120 000 s - 1 and at a temperature of 20 °C. Using ex...
The improvements in vehicle crashworthiness observed in recent years have been closely linked to advanced high-strength steels that are currently being produced or in process of development. Amongst these, Dual-Phase and TRIP (Transformation Induced Plasticity) steels have presented excellent properties for use in crashworthy structures. For these steel grades an understanding of material behaviour at relevant strain rates is needed as well as constitutiv eequations suitable for use in analytic ...
#1Yang Wang(USTC: University of Science and Technology of China)H-Index: 16
#2Y Zhou(USTC: University of Science and Technology of China)H-Index: 9
Last. Yuanming Xia(USTC: University of Science and Technology of China)H-Index: 13
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Abstract In this paper, a new empirically based constitutive model, the modified Johnson–Cook (J–C) model, has been proposed to incorporate the strain rate effects on the initial yield stress and the strain hardening behavior, respectively. The new model can describe the stress–strain relation of metals over a wide range of strain rates. Based on the tensile impact recovery experimental technique, the material constants in the model can be experimentally determined using isothermal and adiabatic...
Abstract This paper presents a part of an on-going study of light-weight shelters made of aluminium alloy AA5083–H116. A necessary prerequisite for numerical simulations of impact behaviour of such shelters is a calibrated numerical model. Slightly modified versions of the two Johnson–Cook models describing flow stress and fracture strain are applied. In addition to ordinary quasistatic tests with smooth specimens, these models demand tests at elevated temperatures and strain rates, and differen...
Abstract null null The present study is focused on the characterization of cyclic loads on the fiber matrix adhesion of regenerated cellulose fibers (RCF) and glass fibers (GF) in a PP matrix with varying contents of maleic anhydride-grafted polypropylene (MAPP). Glass fibers were used for reference purposes. By means of the cyclic loaded single fiber pull-out test (SFPT) the interfacial shear strength (IFFS) and the critical fiber length (lc) are determined as a function of the applied loads, t...
Last. Fatemeh Alavi(TMU: Tarbiat Modares University)H-Index: 5
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Abstract Little is known about the impact behavior of composite fixation plate used in the fracture healing of long bones diaphysis. Hence, this study examined polypropylene composite fixation plates using different glass fibers and measured their biomechanical responses under axial impact loading experimentally and numerically. Short randomly oriented, long unidirectional prepregs and fiber yarn of glass were considered as reinforcements, and fixation plates were fabricated through two differen...
Additive manufacturing of polymers via material extrusion and its future applications are gaining interest. Supporting the evolution from prototype to serial applications, additional testing conditions are needed. The additively manufactured and anisotropic polymers often show a weak point in the interlayer contact area in the manufacturing direction. Different process parameters, such as layer height, play a key role for generating the interlayer contact area. Since the manufacturing productivi...
Abstract Polycarbonate thermoplastic materials have found their usage in many automotive interior type products (e.g. cluster instruments, Head-Up displays etc.), due to their visual aspects offered to the products and to the good mechanical properties possessed, especially in forms of short fiber reinforced composites. This paper presents the tensile behavior of two grades of polycarbonate composites Makrolon 9415 – polycarbonate with 10% glass fiber and Makrolon 8035 – polycarbonate with 30% g...
The dynamic mechanical response of high-performance thermoplastic composites over a wide range of strain rates is a challenging research topic for extreme environmental survivability in the field of aerospace engineering. This paper investigates the evolution of the dynamic properties of woven thermoplastic composites with strain rate and damage process at elevated temperatures. Out-of-plane dynamic-compression tests of glass-fiber (GF)- and carbon-fiber (CF)-reinforced polyphenylene sulfide (PP...
#1Minsoo Kim(KNU: Kongju National University)H-Index: 1
#1Minsoo Kim(KNU: Kongju National University)H-Index: 8
Last. Seokmoo Hong(KNU: Kongju National University)H-Index: 5
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Abstract A strain measurement method is proposed that defines an intrinsic flow stress equation for various strain rates using representative brittle and ductile polypropylene composites. Digital image correlation is used to track strain at the local fracture point. Results are compared with those of the gauge length method. Whereas the strain up to diffuse necking is identical, regardless of the acquisition method, the strain after diffuse necking is completely dependent on the specimen’s fract...
#2Joseph Fitoussi(CNRS: Centre national de la recherche scientifique)H-Index: 18
Last. Abbas Tcharkhtchi(CNAM: Conservatoire national des arts et métiers)H-Index: 2
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Influence of loading temperature on the damage mechanism of polyphenylene sulfide (PPS) reinforced by glass fiber (PPS/GF30) under tension was experimentally studied from quasi-static (QS) to high ...
#2Hemant Chouhan(IITD: Indian Institute of Technology Delhi)H-Index: 9
Last. Naresh Bhatnagar(IITD: Indian Institute of Technology Delhi)H-Index: 32
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Abstract In this study, the influence of hybridization on the compression response of thermoplastic matrix-based composites under high strain rate loading was investigated. The intra-ply and inter-ply hybrid composites were manufactured with Kevlar/Basalt yarns as the reinforcements with Polypropylene as a matrix. Cylindrical composite specimens were laser cut from the flat compression moulded laminates. The composite specimens were loaded under high strain rate using split-Hopkinson pressure ba...
Las simulaciones de impacto en la industria automotriz son ahora una practica comun. Modelaciones de componentes plasticos en choques de vehiculos cubren una amplia gama de velocidades de deformaciones de 0.01-500 s-1. Debido a que las propiedades mecanicas de los plasticos dependen de la velocidad de deformacion, el desarrollo de metodos experimentales para generar curvas de esfuerzo-deformacion en este rango de velocidad es de gran importancia tecnologica. En este articulo, se presenta una maq...