A DYNAMIC PHOTOELASTIC ANALYSIS OF DYNAMIC TEAR TEST SPECIMEN

Dynamic photoelasticity was used to analyse the transient response of Dynamic Tear Test (DTT) specimens, .0889x.400m (3.5 x 15 in.) in size, machined from .0095m (3/8 in.) thick Homalite-100 plates. Dynamic stress intensity factors, dynamic strain energy release rates, and crack velocities in ten specimens were determined. Dynamic tear energies were obtained by integrating the area under the dynamic strain energy release rate curves. The average dynamic strain energy release rates which were obtained by dividing the dynamic tear energies by the total length of the crack paths, were found to be approximately equal to the critical strain energy release rate of Homalite-100. Results of the drop weight hammer impact versus crack initiation experiments showed that the crack initiated after the first build up of impact forces in the hammer thus indicating possible ambiguity in using a specified location on the hammer force curve to derive a comparable static fracture load for the D T T specimen.

• Supplemental Notes:
  • This report was sponsored by the Office of Naval Research, Arlington, VA.
• Corporate Authors:

  University of Washington, Seattle

  Department of Mechanical Engineering
  Seattle, WA  United States  98105
• Authors:
  • Kobayashi, A S
  • Chan, C F
• Publication Date: 1974-10

Media Info

• Features: References;
• Pagination: 23 p.

Subject/Index Terms

• TRT Terms: Dynamic loads; Dynamic tests; Impact loads; Photoelasticity; Strain (Mechanics); Stresses; Tear strength
• Uncontrolled Terms: Strain energy; Stress intensity factors
• Old TRIS Terms: Dynamic tear test
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00084443
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: Intrm. Rpt
• Contract Numbers: N00014-67A-0103-0040
• Files: TRIS
• Created Date: May 1 1975 12:00AM