Creep-Fatigue Crack Growth in Sn-3.0Ag-0.5Cu Solder

Woo, Tae Wuk; Sakane, Masao; Kim, Kwang S.; Kobayashi, Kaoru; Park, Hoon Cheol

doi:10.1299/jmmp.4.1410

Cited by 6 publications

(1 citation statement)

References 41 publications

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“…一方，金属の高温クリープ・疲労き裂進展に対して，大谷ら(平他，1979, 大谷他，1988, 1991)は J 積分範囲を疲労成分とクリープ成分に分割する方法を提案した．この方法は荷重と変位のヒステリシスループを使用した簡便評価による分割法であり，平滑材の寿命に関する Manson (Manson, 1973)のひずみ範囲分割法に対応するものとみなされ，本報告では J 範囲分割法(J-range portioning method)と称することにする． J 範囲分割法は高橋ら(高橋他，2000)によってはんだに適用されている．彼らは荷重制御で，引張側に保持を持つ波形 cp-h，および圧縮側と引張側に保持を持つ波形 cc-h におけるき裂進展に対して，き裂進展速度とクリープ J 積分範囲との関係を求め，波形 cc-h の加速は小さいが，cp-h では大きく加速することを報告している．また，Woo ら (Woo, et al, 2010) (Rice, et al, 1973…”

Section: た．しかし，ここでは，J 積分の疲労成分とクリープ成分は区別されていない．unclassified

Effect of hold time on creep-fatigue crack propagation in lead-free solder

田中

水野

藤井

et al. 2015

Transactions of the JSME (In Japanese)

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Crack propagation tests of lead-free solder were conducted using center-notched plates under load-and displacement-controlled conditions of cyclic tension-compression. Four waveforms were adopted for tests: pp waveform having fast loading and unloading, cc-h waveform having a hold time under tension and compression，cp-h waveform having a hold time under tension, and pc-h waveform having a hold time under compression. The crack propagation rate was correlated to fatigue and creep components of the J-integral range determined from load-displacement curves. For pp waveforms, the crack propagation rate was expressed as a power function of fatigue J integral range and the relation was identical for load-controlled and displacement-controlled conditions. The creep component due to the hold time greatly accelerated the crack propagation rate when compared at the same values of the fatigue J integral, especially under load-controlled conditions of cc-h and cp-h waveforms. Not much acceleration of crack propagation was observed for displacement-controlled conditions. The creep crack propagation rate was expressed as a power function of the creep J integral range for each case of cp-h and cc-h waveforms. The crack propagation rate for cp-h waveforms is higher than that for cc-h waveforms. As a simple estimate, the apparent J-integral range was evaluated from the area between the loading curve and the straight line connecting maximum and minimum loads in load-displacement relations. The relation between crack propagation rate and apparent J-integral range for symmetrical loading waveforms such as cc-h was only slightly higher than that obtained for pp waveforms, and the relation for unsymmetrical loading waveforms with tensile hold such as cp-h was much higher.

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Section: た．しかし，ここでは，J 積分の疲労成分とクリープ成分は区別されていない．unclassified