Short Crack Propagation Law and Fatigue Life Prediction Method for Structural Alloy Steel

Zan Zhi Wang

doi:10.4028/www.scientific.net/AMR.197-198.1400

Paper Titles

A New FEM for Torsion Cracked Cylinder Based on Crack3D FEA Code and Mushhelisvili Torsion Theorem
p.1374

Crystallographic Constitutive Models for Single Crystal Superalloys
p.1381

Model and Imitation of the Cycle Temperature Fields and Deformations of Coke Drum
p.1389

Fatigue Behavior Analysis of Cruciform Welded Joints by Infrared Thermographic Method
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Short Crack Propagation Law and Fatigue Life Prediction Method for Structural Alloy Steel
p.1400

Study on the Difference of the Propagation Characteristics between Open Flaws and close Flaws in Brittle Materials under Compressive Loading
p.1406

Research on the Key Parameter of the Core Part on the Equipment for Peeling Off the Gingko’s Shell
p.1412

Failure Analysis of the Guide Pillar in a Progressive Die
p.1416

Experimental Investigation of Dilatancy-Bulking Behavior of Weak Sandstone
p.1420

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Short Crack Propagation Law and Fatigue Life Prediction Method for Structural Alloy Steel

Abstract:

35CrMo and 42CrMo are the two main structural alloy steels in China, and are widely used in making important structural components subjected to heavy loads. In order to search after their fatigue properties under cyclic loads, 33 specimens were tested, under different stress level and different stress ratio from each other, to observe their crack initiation lives and the failure lives, together with the growing short crack lengths at various cycles. All tests were conducted using the MTS 810-22 material testing system. Based on the results from the tests, the relationships between the maximum stress range at crack tip and the number of cycles prior to crack initiation were determined, and in the meanwhile, the small crack propagation laws and the threshold stresses for fatigue crack initiation were obtained. In the end, the fatigue life prediction method for the two structural alloy steels was carried out.