Abstract
The use of shock resistant RT-PMMA in engineering structures potentially subject to accidental overloading requires an evaluation of its crack arrest capability under impact loading. Based on experimental results obtained from a series of Kalthoff and Winkler (KW)-type impact tests, the present study aims at numerically reproducing the conditions for brittle-like crack initiation and propagation in impact-loaded RT-PMMA. For that purpose, three-dimensional SPH numerical simulations were conducted and the performance of various failure criteria was evaluated. The numerical model together with a combination of stress- and strain- dependent failure criteria were shown to fairly reproduce the experimental results in terms of finite crack advance and orientation.
Highlights
A way of improving the poor impact resistance of PMMA consists in embedding rubber nano-particles inside a PMMA matrix to form the so-called rubber toughened PMMA or RT-PMMA, see [1]
A series of Kalthoff and Winkler (KW)-type impact tests [2,3] has been carried on several grades of RT-PMMA evidencing the role of the rubber nanoparticles concentration, see [4,5]: the higher the nano-particles concentration the higher the resistance to crack propagation
The present study aims at numerically reproducing the conditions for brittle-like crack initiation and propagation in impact-loaded pre-cracked RT-PMMA
Summary
A way of improving the poor impact resistance of PMMA consists in embedding rubber nano-particles inside a PMMA matrix to form the so-called rubber toughened PMMA or RT-PMMA, see [1]. A series of Kalthoff and Winkler (KW)-type impact tests [2,3] has been carried on several grades of RT-PMMA evidencing the role of the rubber nanoparticles concentration, see [4,5]: the higher the nano-particles concentration the higher the resistance to crack propagation. Based on these tests, the present study aims at numerically reproducing the conditions for brittle-like crack initiation and propagation in impact-loaded pre-cracked RT-PMMA. A parametric study was achieved to calibrate the adopted failure criterion
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