A CRACK CLOSURE MODEL FOR PREDICTING THE THRESHOLD STRESSES OF NOTCHES |
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| Authors: | Jason C Ting Frederick V Lawrence Jr |
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| Affiliation: | Research Engineer, Walsin Lihwa Corporation, Kaohsiung, Taiwan;Professor, Departments of Civil Engineering and Material Science and Engineering, University of Illinois, Urbana, IL 61801, U.S.A. |
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| Abstract: | A model is proposed to estimate the threshold stress range of a notched component. The model considers the variation of crack closure with crack length in the presence of a notch. The threshold stress range was found from the condition that the minimum value of effective threshold stress intensity range of a crack emanating from a notch equals the effective threshold stress intensity range of a “long” crack. The effects of notch depth, of notch acuity, of notch and specimen type, of load ratio, and of material properties on the threshold stresses were considered. Experimental data reported in the literature were used to assess the validity of the model. It was found that the model correctly predicts the behavior of cracks in notched components. |
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