STP711

    Comparison of Crack Behavior in Homalite 100 and Araldite B

    Published: Jan 1980


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    Abstract

    Currently, two polymeric materials, Homalite 100 and Araldite B, are extensively utilized in the study of dynamic fracture. Homalite 100 is employed in the dynamic photoelastic studies of Dally et al of the University of Maryland, and Kobayashi et al of the University of Washington. They have determined the instantaneous stress-intensity factor from the isochromatic fringe loops and have studied the influence of specimen geometry on crack propagation and arrest, postarrest oscillations, and K-versus-˙a relationships.

    Araldite B is employed by Kalthoff et al of the Institüt für Festköpermechanik of the Federal Republic of Germany. In their study of dynamic fracture with Araldite B, however, the instantaneous stress-intensity factor is determined by the method of shadow patterns (caustics). The results of photoelastic studies with Homalite 100 and caustic studies with Araldite B show good agreement in some areas, but disagreement in other areas. Since dynamic fracture behavior is studied with two different materials and two different methods, it is difficult to determine whether the points of disagreement are due to material properties or experimental method.

    This paper presents the results of a characterization of the physical and mechanical properties and photoelastic observations of dynamic crack behavior of Homalite 100 and Araldite B. Also presented are detailed observations of the differences in fracture surface features of the two materials, and a discussion of the effect of material properties and specimen geometry on crack propagation, crack arrest, and postarrest oscillation.

    Keywords:

    photoelasticity, crack propagation, crack initiation, fracturing, crazing, dynamic properties, mechanical properties, physical properties, viscoelastic properties, stress-intensity factor, polymers


    Author Information:

    Metcalf, JT
    Assistant professor and professor, University of Maryland, College Park, Md.

    Kobayashi, T
    Assistant professor and professor, University of Maryland, College Park, Md.


    Paper ID: STP27444S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP27444S


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