Accession Number : AD0745792

Title :   Crack Propagation and Arrest in Impacted Plates.

Descriptive Note : Technical rept.,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Kobayashi,A. S. ; Wade,B. G.

Report Date : JUL 1972

Pagination or Media Count : 28

Abstract : Crack propagation and arrest in impacted, edge-cracked, tension plates composed of Homalite-100 sheets were studied by dynamic photoelasticity. Dynamic stress intensity factors, crack velocities and dynamic stress concentrations at the arresting hole were determined and compared with corresponding static values which were computed by the method of finite element analysis. Significant influence of the reflected stress waves generated by the impact was noticed in this investigation. The otherwise stable crack appeared to run intermittently when the dynamic stress intensity factor exceeded the static fracture toughness of the material. The static stress field surrounding the arresting hole appeared relatively ineffective in influencing the path of crack propagation. Conclusions reached in this investigation are similar to those published previously except for the more pronounced stress wave effects in these series of experiments. (Author)

Descriptors :   (*FRACTURE(MECHANICS), PANELS), IMPACT TESTS, CRACK PROPAGATION, CRACKS, INHIBITION, ORIFICES, PHOTOELASTICITY, STRESSES

Subject Categories : Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE