CAJ | 학술논문

镍基高温合金的概率寿命预测要求模拟多种复杂随机现象。针对室温下航空发动机涡轮盘用GH4133B 合金的疲劳裂纹扩展试验数据，采用Paris公式和含门槛值?Kth的修正Paris公式，对不同应力比下的疲劳裂纹扩展速率进行概率预测。基于Paris公式和修正Paris公式的积分式计算不同存活概率P下的理论疲劳剩余寿命Nfp，并与试验疲劳剩余寿命Nft对比。结果表明，当P=50%时，基于修正Paris公式的Nfp与Nft吻合；当P=90%时，基于Paris公式和修正Paris公式的Nfp均与Nft吻合；当P=99%时，基于修正Paris公式的Nfp具有高可靠度。基于疲劳寿命试验数据的非线性回归分析绘制Nf-Fp,m-Fp,a曲面，引入参量γ表征平均载荷Fp,m和载荷幅值Fp,a对疲劳寿命Nf的影响，结果表明，在所研究的应力比范围内Fp,m对Nf影响大。
얼기고온합금적개솔수명예측요구모의다충복잡수궤현상。침대실온하항공발동궤와륜반용GH4133B 합금적피로렬문확전시험수거，채용Paris공식화함문함치?Kth적수정Paris공식，대불동응력비하적피로렬문확전속솔진행개솔예측。기우Paris공식화수정Paris공식적적분식계산불동존활개솔P하적이론피로잉여수명Nfp，병여시험피로잉여수명Nft대비。결과표명，당P=50%시，기우수정Paris공식적Nfp여Nft문합；당P=90%시，기우Paris공식화수정Paris공식적Nfp균여Nft문합；당P=99%시，기우수정Paris공식적Nfp구유고가고도。기우피로수명시험수거적비선성회귀분석회제Nf-Fp,m-Fp,a곡면，인입삼량γ표정평균재하Fp,m화재하폭치Fp,a대피로수명Nf적영향，결과표명，재소연구적응력비범위내Fp,m대Nf영향대。
Probabilistic life prediction of nickel-base superalloy requires the modelling multiple complex random phenomena. The fatigue crack growth rates at various stress ratios are probabilistically predicted using the Paris formula and the modified Paris formula with threshold value?Kth for fatigue crack growth test data of GH4133B superalloy used in turbine disk of aero-engine at room temperature. The theoretic fatigue crack growth livesNfp at various survival probabilitiesP predicted by integral based on the Paris formula and the modified Paris formula are calculated and compared with the test onesNft. It is shown thatNfp obtained by integral based on the modified Paris formula is well fitted withNft atP=50%, while bothNfp obtained by integral based on the Paris formula and that obtained by integral based on the modified Paris formula are all well fitted withNft atP=90%, andNfp obtained by integral based on the modified Paris formula possesses a high reliability atP=99%. A 3DNf-Fp,m-Fp,a fatigue life surface are plotted based on the nonlinear regression analysis of fatigue life test data, and a parameterγ is introduced to characterize the effect of mean loadFp,m and load amplitudeFp,a on fatigue lifeNf. It is suggested that the effect ofFp,m on Nf is larger than that ofFp,a on Nf.