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首页> 美国政府科技报告 >Investigation of Mechanism of Failure of High-Strength Materials. Part II. The Effect of Thickness and Tempering Temperature on Fracture Appearance Transition Temperature and Critical Fracture Toughness of High Strength Sheet Steel
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Investigation of Mechanism of Failure of High-Strength Materials. Part II. The Effect of Thickness and Tempering Temperature on Fracture Appearance Transition Temperature and Critical Fracture Toughness of High Strength Sheet Steel

机译：高强度材料失效机理研究。第二部分。厚度和回火温度对高强度钢板断裂外观转变温度和临界断裂韧性的影响

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The critical fracture toughness parameter, K sub c, of AMS-6434 sheet steel reflected a degree of independence of specimen thickness at yield strengths, sigma sub YS, of 191.5 and 236 ksi, when considered in terms of any particular test temperature within the range -300 to 300F. The K sub c parameter generally followed the trend established by increasing proportion of shear fracture, regardless of the existence of individual or collective effects of sheet thickness, tempering temperature or test temperature. Fracture appearance transition temperature, FATT, was observed to decrease non-linearly with decreasing specimen thickness for sigma sub YS = 191.5 and 236 ksi. The effect of decreasing thickness was relatively more pronounced in depressing FATT than was the effect of increasing tempering temperature. (Author)

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