Abstract
Tensile tests conducted on butt joined epoxy-aluminum plates containing single cracks along the bond surfaces showed that there exists a characteristic crack length below which the fracture strength of the composite is mainly influenced by the stress concentrations at the bond edges. For specimens with cracks longer than the characteristic length the fracture of the composite is entirely controlled by the stress concentrations at crack tips. In the latter case the stress intensity factors defined by Sih and Rice, and Erdogan appeared to agree reasonably well with test results.
Zusammenfassung
Zugproben an stumpf aneinandergefügten, mit einzelnen Rissen nach den Bindeflächen behafteten Epoxyharz-Aluminiumplatten zeigen, daß es eine charakteristische Rißlänge gibt, unterhalb deter die Bruchfestigkeit des Verbundhalbzeugs maßgeblich von den Spannungskonzentrationen an den Bindekanten beeinflußt wird. Bei Probestücken mit Rissen, die gegen die charakteristische Länge groß sind, wird der Bruch des Verbundhalbzeugs gänzlich von den Spannungskonzentrationen an den Spitzen der Risse bestimmt. Im letzteren Fall scheinen die von Sih und Rice bzw. von Erdogan defmierten Intensitätsfaktoren vertretbar gut mit den Versuchsergebnissen übereinzustimmen.
Résumé
Des essais a la traction, effectués sur plaques d'époxyde-aluminium jointes par rapprochement et contenant crevasses individuelles le long des surfaces de joint, montrent qu'il existe une longueur caractéristique de crevasse, au-dessous de la résistance à la rupture du composé est essentiellement influencée par les concentrations de tractions aux arêtes de joint. Pour échantillons avec crevasses dont la longueur est grande devant la longueur caractéristique, la rupture du composé est déterminée entièrement par les concentrations de tractions an bout des crevasses. Dans ce dernier cas, les coefficients d'intensité de traction, définis par Sih et Rice et par Erdogan, semblent s'accordei plutôt bien avec les résultats des essais.
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Wang, T.T., kwei, T.K. & Zupko, H.M. Tensile strength of butt-joined epoxy-aluminum plates. Int J Fract 6, 127–137 (1970). https://doi.org/10.1007/BF00189820
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DOI: https://doi.org/10.1007/BF00189820