Approximation of Non-Linear Stress–Strain Curve for GFRP Tensile Specimens by Inverse Method

Abstract

Studying the characteristics of materials through a finite element analysis (FEA) has various benefits; hence, many studies have been conducted to improve the reliability of the analysis results. In general, the mechanical properties used in FEA for metals and metal composites are stress–strain data obtained through tensile tests, which are used for modeling from a macroscopic perspective. While many studies have been conducted on metal materials, there are limited studies on the analysis of polymer composite materials produced through injection and special processing. In this study, existing inverse methods were applied, and an FEA was conducted to reproduce the axial displacement of the tensile specimens comprising glass fiber-reinforced polymer (GFRP); further, errors were examined by comparing the test and analysis results. To reduce such errors, the experiment and the FEA results were analyzed through parameter optimization based on various empirical formulas. The accuracy of various inverse methods were examined and an inverse method suitable for GFRP was proposed.

Inverse Finite Element Approach to Identify the Post-Necking Hardening Behavior of Polyamide 12 under Uniaxial Tension

“…This approach uses FE simulations coupled with an optimization routine to identify the material properties that represent best the experimentally determined mechanical behavior of a specimen. Shin et al [14] used an inverse finite-element (FE) approach to fit the hardening law to the experimental data of fiber-reinforced polymers without necking. Zhang et al [15] proposed an inverse approach synchronized with a DIC setup to identify the post-necking behavior of metallic sheets, without neck propagation.…”

Review of the Mechanistic and Structural Assessment of Binders in Electrodes for Lithium-Ion Batteries

“…Figure 8: Schematic of the tests for the adhesive property of the electrodes: (a) scratch test[138], (b) SAICAS method[123], and (c) tensile test[139].…”