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在低温下利用单试件法确定15MnVN材料J_R阻力曲线及J_(IC)

Measuring J_(IC) and J-R Curve of 15MnVN Materal Under Low Temperature by a Single Specimen Method
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摘要 试验采用三点弯曲试件,应用屈服后的卸裁柔度EBC=f(△α/ω-α_0)来确定各卸裁点下的△α_i,进而确定J_R阻力曲线。介绍了V_g-△曲线,提出第二拐点法确定启裂点的新途径,并与多试件法的结果做了比较,误差在10%以内。 The TPB specimen was used in the experiment. The Δai of every unloading points was were determined by means of the unloadingcompliance curve LEBC = f(Δa/w-a0) of a post-yeild spedimen. Meanwhie,the J-R curve was determined. A new approach to get the crack initiation point has been introduced by using the second of inflexion on the Vg-A curve. The new results were obtined from the new approach. As compared with the multispecimen methnd, this method is much betler withe erors being less than 10 per cent.
出处 《北京工业大学学报》 CAS 1987年第4期81-90,共10页 Journal of Beijing University of Technology
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