【摘要】：在U形切槽梁雙參數(shù)測試法理論推導基礎上,試驗了21個大理巖U形切槽梁試樣,用雙參數(shù)法確定其拉伸強度和斷裂韌度.為了保證測試結(jié)果的有效性,在斷裂后的半截U形切槽梁上鉆取了8個巴西圓盤試樣和7個人字形切槽巴西圓盤試樣,分別單獨測試其拉伸強度和斷裂韌度.不同方法測試結(jié)果比較表明:由U形切槽梁雙參數(shù)測試法得到的拉伸強度和斷裂韌度分別與用巴西圓盤試樣測得的拉伸強度和用人字形切槽巴西圓盤試樣測得的斷裂韌度接近.用Gómez有關文獻中PMMA材料的U形切槽梁實驗數(shù)據(jù)進行分析,再次證實了U形切槽梁雙參數(shù)測試法的有效性.
[Abstract]:On the basis of the theoretical derivation of the two-parameter test method for U-cut beam, 21 specimens of U-cut beam of marble were tested, and the tensile strength and fracture toughness of the specimens were determined by two-parameter method. In order to ensure the validity of the test results, 8 Brazilian disk specimens and 7 individual zigzag notched Brazilian disk specimens were drilled on the half-cut U-shaped notched beam after fracture. The tensile strength and fracture toughness of the specimens were measured separately. The results of different test methods show that the tensile strength and fracture toughness obtained from the double parameter test of U-shaped notched beam are close to those obtained from the Brazilian disc specimen and the human zigzag cut groove Brazilian disc specimen, respectively.The results show that the tensile strength and fracture toughness obtained by the two-parameter test method are similar to those obtained from the Brazilian circular disk specimen with the zigzag groove. By using the experimental data of PMMA material in G 貿(mào) mez's literature, the validity of the two-parameter test method of U-shaped notched beam is proved again.
【作者單位】： 重慶交通大學山區(qū)橋梁與隧道工程國家重點實驗室培育基地;重慶交通大學土木工程學院;四川大學土木工程及應用力學系;
【分類號】：TB301;;TB302.1

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