In N-494,by using specially defined L r as sbacissa, the scatter of FAC for piping containing circumferential crack is reduced compared to that using S r as sbacissa,especially for θ/π≤0 5.The N-494 FAC can assure ...In N-494,by using specially defined L r as sbacissa, the scatter of FAC for piping containing circumferential crack is reduced compared to that using S r as sbacissa,especially for θ/π≤0 5.The N-494 FAC can assure the safety and reasonableness of assessment when θ/π≤0 5.But the applicable range for N-494 FAC is limited in θ/π≤0 5, otherwise the assessment accuracy is worse. Since the material stress-strain relationship used in N-494 is weaker than that of real material, so that the FAC is over conservative. Therefore, more accurate FAC for piping containing circumferential crack of any size should be developed.展开更多
文摘In N-494,by using specially defined L r as sbacissa, the scatter of FAC for piping containing circumferential crack is reduced compared to that using S r as sbacissa,especially for θ/π≤0 5.The N-494 FAC can assure the safety and reasonableness of assessment when θ/π≤0 5.But the applicable range for N-494 FAC is limited in θ/π≤0 5, otherwise the assessment accuracy is worse. Since the material stress-strain relationship used in N-494 is weaker than that of real material, so that the FAC is over conservative. Therefore, more accurate FAC for piping containing circumferential crack of any size should be developed.
