Abstract
Closed-cell polyvinylchloride (PVC) foams are widely used as core for sandwich composites for applications, in which multiaxial loads are involved. In the present work a wide range of uniaxial (tension, compression and torsion) and multiaxial experiments (both simultaneous tension-torsion and compression-torsion) were conducted on a high performance PVC foam. Failure data for each experiment were collected and depicted in the invariants plane. The whole cylindrical surface of the specimen was monitored by means of an 8-camera-system, strain fields were obtained by 3D-DIC. Hence, the occurrence and the evolution of deformation bands were inspected. The usage of an 8-camera system was essential for the observation of the deformation mechanism, especially for pure compression, pure torsion and combined axial load-torsion, in which the arising of deformation bands is affected by the occurrence of buckling and the orthotropy of the foam.
Highlights
The deformation of the specimen was inspected for some specific loading cases by means of the threedimensional digital image correlation (3D-DIC) and an 8-camera system
Pure torsion and combined tension-torsion, the specimen fractured at the end of the tests, the load leading to the rupture of the specimen was considered as failure load
The load leading the specimen to yielding was considered as failure load
Summary
Conducted combined tension-torsion and compressiontorsion tests among other experiments on hollow cylindrical specimens made of PVC foams. Compression and torsion experiments were conducted and failure loads are determined.
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