Dynamic Photoelasticity and Dynamic Finite Element Analyses of Polycarbonate Dynamic Tear Test Specimens.

Abstract

Dynamic photoelasticity and dynamic finite element methods were used to study dynamic responses of dynamic tear test (DTT) specimens of a ductile material, i.e. 3.2 mm (1/8 in.) thick polycarbonate sheets. Dynamic photoelastic patterns before and after the onset of unstable fracture showed that the dynamic fracture initiation toughness, K sub id, was attained during the second maximum load in the hammer load-time history and was approximately 65 percent of the fracture toughness, K sub ic. Also dynamic stress intensity factors before and after crack propagation computed by dynamic finite element method using experimentally determined hammer load-time history were in reasonable agreement with those obtained from dynamic photoelasticity. The computed dynamic stress intensity factor prior to crack propagation was also in excellent agreement with the static stress intensity factors computed from dynamic strains adjacent to the crack tip. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1978
Accession Number
ADA049681

Entities

People

  • Albert S. Kobayashi
  • S. Mall
  • Y. Urabe

Organizations

  • University of Washington

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Agreements
  • Crack Propagation
  • Crack Tips
  • Elastic Properties
  • Engineering
  • Failure Mode And Effect Analysis
  • Finite Element Analysis
  • Impact Loads
  • Kinetic Energy
  • Mechanics
  • Modulus Of Elasticity
  • Numerical Analysis
  • Strain Gages
  • Strain Rate
  • Stress Intensity Factors
  • Stress Waves
  • Stresses

Fields of Study

  • Engineering

Readers

  • Explosive Engineering.
  • Structural Health Monitoring of Composite Structures.