The effects of plastic deformation on stress wave propagation in multi-layer materials

• Published in: International journal of impact engineering Vol. 34; no. 11; pp. 1797 - 1813
• Main Authors: Tasdemirci, A., Hall, I.W.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.11.2007; Elsevier Science
• Subjects: Exact sciences and technology; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); High strain rate; Inelasticity (thermoplasticity, viscoplasticity...); Multilayer structures; Numerical simulation; Physics; Plastic deformation; Solid mechanics; Static elasticity (thermoelasticity...); Stress wave propagation; Structural and continuum mechanics; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); Numerical simulation; Plastic deformation; Multilayer structures; Stress wave propagation; High strain rate; High strain; Solid solid interface; Metal; Elastic wave; Modeling; Inelasticity; Strain gradient; High speed; Plasticity; Copper; Ceramic materials; Strain rate; Axial stress; Stress analysis; Stratified material; Stress wave; Plastic wave; Aluminium; Experimental study; Strain wave; Structural analysis
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2006.10.005

The behavior of a multi-layer material at high strain rate and the effect of plastic deformation on stress wave propagation were investigated by a combination of experimental and numerical techniques. Plastic deformation effects were studied in multi-layer materials consisting of ceramic, copper and aluminum subjected to large strains under high strain rate loading. First, stress wave propagation behavior for the monolithic metals was studied, and then extended to multilayer combinations of these metals with each other and with a ceramic layer. The axial stress distributions were found to be non-uniform in the elastic deformation range of the specimen. The degree of non-uniformity was much more pronounced in the multi-layer samples consisting of different materials. The presence of a ceramic layer increased the magnitudes of stress gradients at the interfaces. It was also found that a major effect of plastic deformation is a tendency to produce a more homogeneous stress distribution within the components. The implications of these observations for practical systems are discussed.