Experimental Mechanics

, Volume 22, Issue 10, pp 383–391 | Cite as

Crack propagation at material interfaces: II experiments on mode interaction

Optical interferometry is used to examine the validity of linearized field theories and criteria for stationary and propagating interfacial cracks
  • K. M. Liechti
  • W. G. Knauss


Optical interferometry is used to measure crackopening profiles for interfacial cracks in a model adhesive joint. Application of boundary displacements with a resolution of 0.16 μm is achieved through a combination of thermal expansions and optical control in a servo loop. The degree of nonlinear deformation accompanying small levels of normal and shear strain across the bond is documented, and crackfront displacement fields are exploited to evaluate possible criteria for crack growth under combined normal and shear loading. Within the accuracy afforded by the crack-propagation investigation it appears that crack growth is governed by the vectorial crack-tip displacements, namely by the vector sum of the local normal and tangential displacement components. In the limit of infinitesimal strains this criterion reduces to the strain energy-release-rate criterion of linear fracture mechanics.


Shear Strain Interfacial Crack Shear Loading Displacement Component Adhesive Joint 
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  1. 1.
    Knauss, W.G., On the Steady Propagation of a Crack in a Viscoelastic Sheet: Experiments and Analysis,” Deformation and Fracture of High Polymers, ed. by Kaush, Hassel and Jaffee, Plenum Press (1973).Google Scholar
  2. 2.
    Wang, S.S. and Yau, J.F., “An Analysis of Interface Crack in Adhesively Bonded Lap Shear Joints,” Modern Development in Composite Materials and Structures, ed. by J.R. Vinson, ASME, 67–83 (1979).Google Scholar
  3. 3.
    Liechti, K.M., “The Application of Optical Interferometry to Time Dependent Unbonding,” PhD Thesis Cal. Instit. of Tech. (May 1980).Google Scholar
  4. 4.
    Liechti, K.M. andKnauss, W.G., “Crack Propagation at Material Interfaces: I. Experimental Techniques to Determine Crack Profiles,”Experimental Mechanics,22 (7),262–269 (July1982).Google Scholar
  5. 5.
    Comninou, M. andSchmueser, D., “The Interface Crack in a Combined Tension-Compression and Shear Field,”J. Appl. Mech.,46,345–348 (1979).Google Scholar
  6. 6.
    Knauss, W.G. and Mueller, H.K., “The Mechanical Characterization of Solithane 113 in the Swollen and Unswollen State,” Caltech, GALCIT SM 67-8, Pasadena, CA (Dec. 1967).Google Scholar
  7. 7.
    Knowles, J.K. andSternberg, E., “On the Singularity Induced by Certain Mixed Boundary Condition in Linearized and Nonlinear Elastostatics,”Int. J. Solids and Struct.,11,1173 (1975).CrossRefGoogle Scholar
  8. 8.
    Shih, C.F., deLorenzi, H.G. and Andrews, W.R., “Studies on Crack Initiation and Stable Crack Growth,” Elastic-Plastic Fracture, ASTM STP 668, ed. by J.D. Landes, J.A. Begley and G.A. Clarke, ASTM, 65–120 (1979).Google Scholar
  9. 9.
    Kanninen, M.F., et al., “Elastic-Plastic Fracture Mechanics for Two-Dimensional Stable Crack Growth and Instability Problems,” Elastic-Plastic Fracture, ASTM STP 688, ASTM, 121–150 (1979).Google Scholar
  10. 10.
    Achenbach, J.D., Keer, L.M., Khetan, R.P. andChen, S.H., “Loss of Adhesion at the Tip of an Interface Crack,”J. of Elasticity,9,397–424 (1979).CrossRefGoogle Scholar
  11. 11.
    Rice, J.R. andShih, G.C., “Plane Problems of Cracks in Dissimilar Media,”J. Appl. Mech.,32,418–423 (1965).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1982

Authors and Affiliations

  • K. M. Liechti
    • 1
  • W. G. Knauss
    • 2
  1. 1.Aerospace Engineering and Engineering MechanicsUniversity of TexasAustin
  2. 2.California Institute of TechnologyPasadena

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