✍ Scribed by Y. Yu; I.A. Ashcroft; G. Swallowe
No coin nor oath required. For personal study only.
This paper describes an investigation of residual stresses in epoxy-steel systems using a bi-material beam. Residual stresses due to curing shrinkage, differential thermal contraction and hygroscopic expansion were investigated. Curvature in the bi-material beams was used as a measure of residual stress and simple beam theory was used to relate curvature to stresses and strains in the beam. Good agreement was achieved between predicted and experimental curvature of the beam. It was shown that in the system studied, the shrinkage stresses associated with the initial cure reaction were small, but considerable stresses developed on cooling due to differential thermal contraction of the two materials. However, on repeat thermal cycling, the residual stresses increased, which was interpreted as evidence of a post-cure effect. Samples exposed to moisture demonstrated significant stress relaxation, which was proportional to the weight of water absorbed. This was attributed mainly to the hygroscopic expansion of the adhesive.
📜 SIMILAR VOLUMES
This paper considers re-assessment of the material behavior of stainless steels 1.4021 and 1.4841 using the compression test at medium strain and high temperature (1100 • C), for forming simulation, and compares the result of the forging test with the finite element simulation predictions using the
Abstmct-The grinding process is known to in&ice high m~nitudes of tensile residuai stresses beneath a surface which are responsible for development of cracks over the ground surface. In this paper, measurements of mouth opening displacement (MOD) values have been used to determine the influence of r
Composites of two Ti-based alloys (Ti-14A1-21Nb and Ti-6A1-4V (weight per cent)) containing SCS-6 SiC fibers have been characterized microstructurally and are used as model systems in which to study the influence of fiber volume fraction and post-consolidation deformation on residual axial fiber str