A study on fracture behavior due to crack propagation at compact tension specimen composed of inhomogeneous metal materials with holes near crack

摘要

This paper aims at studying on the fracture behavior due to crack propagation at compact tension specimen composed of inhomogeneous metal materials with holes near main crack. In this study, the experiments were performed for compact tension specimens produced by the mutual bonding metals of stainless steel and brass, and the simulation analyses to verify these experiments were conducted. When the preceding study results are confirmed, the design of structures with no holes near a crack becomes more durable on the strength aspect than the design of structures with holes existing near the crack. The design for highest strength is possible if no holes are pierced in inhomogeneous metal materials bonded with adhesives. On the other hand, in case the holes due to additional bolt and rivet fastening must be pierced, the most similar tendency to that of materials without holes is exhibited when the hole center is placed by about 20 mm from the crack tip. A great difference in strength occurs according to the hole position near the main crack at inhomogeneous metal materials bonded with adhesives. So, the design considering this aspect is deemed important. The data for different positions where the crack propagations occur can be confirmed at analysis and experimental results. Therefore, the changes inside the material that are actually difficult to confirm due to the crack growth characteristics at inhomogeneous materials can be expected through an analysis. The fracture behavior of inhomogeneous metal materials bonded by adhesives was investigated through the experiment and analysis. The basic data through this study could be secured at contributing to the developed design of light-weight composite materials as well as bonding the technology for mutually different materials.