• 作者： 孫吳
• 作者服務機構： 國立臺灣大學
• 中文摘要： 本研究工作討論金屬材料在梯次應變幅及梯次應力幅實驗中之低次疲勞性質，實驗材料為低碳鋼（1020）和鋁合金〈6063），首先概論金屬材料在一定應力幅和一定應變幅實驗中之循環硬化和循環軟化現象，金屬材料之疲勞性質，諸如疲勞延度指數，疲勞延度係數，疲勞強度指數，疲勞強度係數。計算材料每循環所吸收之塑性應變能，以及材料斷裂時所吸收之總塑性應變能。依據材料每循環所吸收之破壞塑性應變能為一常數，推演出一合理之公式，計算在梯次應力幅或梯次應變幅下材料疲勞斷裂和循環次數之關係。 測定低碳鋼和鋁合金之布辛格效應，說明布辛格效應發生之原因及測定之方法，以及簡介應用布辛格效應之一實例。
• 英文摘要： This report discusses the Low cycle fatigue and the plastic strainenergy analysis of low carbon steel（1020) and aluminum alloy (6063) underdifferent stages of constant strain amplitude and constant load amplitude.The cyclic strain hardening and cyclic strain softening of the two metalswere observed during the tests. Fatigue Properties such as fatigue-ductilityexponent, fatigue-ductility coefficient, fatigue-strength exponent, andfatigue-strength coefficient under constant strain amplitude ane loadamplitude have been determined．The plastic strain energy per cycle andthe total plastic strain energy to fracture the specimen have been cal-culated．From the plastic strain energy per cycle an empirical equation for thefacture of the specimen under different stages of constant strain amplituedand load amplitude was established. The data of Bauschinger Effect of the two metals were obtained, oneapplication of Bauscninger Effect was introduced.
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