Neck retardation and enhanced energy absorption in metal–elastomer bilayers

摘要: Retardation of necking under biaxial stretching bilayer plates comprised an elastomer layer bonded to a metal is studied. Substantial increases in limits and consequent energy absorption can be achieved metal–elastomer bilayers for both quasi-static dynamic stretching. The phenomena tied the fact that incremental modulus remains essentially unchanged, or increases, while steadily decreases. effective decreases with but at lower rate than itself. Since instabilities are associated erosion modulus, delayed larger strains. Although strength having same mass/area as all-metal plate reduced, it nevertheless absorb more if ratio yield stress sufficiently large. first part paper derives capacities second analyses axisymmetric neck development clamped circular subject impulsive pressure loads. ability sustain intense impulses compared performance material total mass. Outstanding issues requiring further study discussed.