Polypropylene Tensile Test Under Dynamic Loading

Abstract

In this paper, a testing method is developed to determine the dynamic stress-strain responses of the polypropylene (PP) under high strain rate uniaxial tension conditions. The main objective of this study is to determine the dynamical behaviour of PP materials under transitory loading. To this effect, an experimental machine using a mixed technique of Hopkinson tension bar and a sensing block system is developed in order to study the dynamic tensile stress-strain behaviour of the low-strength and low mechanical impedance specimen. A pendulum pulse technique is employed in dynamic tension experiments to ensure that valid experimental conditions are satisfied. Results show that, compared with quasi-static behaviour, dynamic tension causes smaller failure strains. Among other, the experimental setup , mechanical characteristic, dynamic tensile specimen, quasi-static tensile test: stress-strain curve for 0.8 s-1 strain rate, the incident and the transmitted waves recorded by the stain gauges located on the bar and the sensing block under a dynamic tensile test, the axial strain on the specimen versus time under a dynamic tensile test, the axial stress on the specimen versus time under a dynamic tensile test, dynamic tensile test: stress-strain curves of the PPC7712 polymer for various strain rates, the specimens after rupture quasi-static test and dynamic test are presented in the paper.

Finite Element Model of Scoliosis Brace with Increased Utility Characteristics

“…Excluding the minimal surface areas where the load and supports were located, the majority of the orthosis exhibited stress levels below 6.5 MPa (Figure 2). This stress level is consistent with the linear segment of the stress-strain curve for polypropylene [13,14], confirming previous assumptions about the linearity of the model.…”

Influencia de la geometría del proyectil en ensayos dinámicos de tracción

“…Éste tiene una forma de cilindro hueco y se mueve sobre la barra incidente hasta un tope situado en el extremo de ésta, donde se produce el impacto. [13] [14]. La forma de acelerar el proyectil se realiza mediante un sistema de aire comprimido que tiene una presión máxima de 8 bares [15] [16].…”

Numerical analysis of the influence of the damping rings’ dimensions on interrupted dynamic tension experiment results

“…On the contrary, the propagation of these waves from the impact area to the entire specimen is a time-dependent variable. 15 The strain histories e i , e r and e t corresponding to the incident, reflected and transmitted wave, respectively, are measured at well-chosen points on the Hopkinson bars. 16 The feasibility of a finite element (FE) modified SHTB model for dynamic experiments is presented in this article.…”