Effect of material mismatch on dynamic failure of interfaces
- Univ. of Rhode Island, Kingston, RI (United States)
An experimental study has been conducted to study the effect of mismatch of material properties on the dynamic failure of interfaces. The bimaterial specimens are fabricated using various material systems with different elastic properties. The specimen is then loaded dynamically by impacting it with a projectile fired from a pressurized gas gun. This impact results in a compressive wave which traverses the width of the specimen and reflects from the free surface as a tensile stress wave pulse. The tensile loading of the crack tip results in fracture initiation and subsequent crack growth along the interface. This entire event is observed using dynamic photoelasticity in conjunction with high speed photography. The isochromatic fringe patterns obtained using dynamic photoelasticity provide full field information about the dynamic fracture process. Location of the crack tip as a function of time is determined directly from these isochromatic fringes. These data are differentiated with respect to time to provide the velocity of the dynamically propagating interface crack. Typically, the moving crack tip attains very high velocities, which exceed the shear wave velocity of the more compliant material comprising the interface. This exceeding of the shear wave velocity results in the formation of shock patterns ahead of the crack tip. In addition to determining the crack tip location, the isochromatic fringes also provide full field information about the stress field surrounding the dynamically propagating crack tip. The photoelastic information is analyzed to determine various fracture parameters including the complex stress intensity factor and the non-singular terms. The analysis is based on the higher order asymptotic field equations. The variation in the fracture parameters as a function of crack velocity, crack position and mismatch of material properties will be presented and discussed at the meeting.
- OSTI ID:
- 175185
- Report Number(s):
- CONF-950686-; TRN: 95:006111-0105
- Resource Relation:
- Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
- Country of Publication:
- United States
- Language:
- English
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