Physics

Finite element method

Strain energy

Mechanics

Cracking

Structural engineering

Torsion (gastropod)

Goodman relation

Engineering

Surgery

Composite material

Shear stress

Materials science

Strain energy density function

Stress concentration

Fatigue testing

Fracture mechanics

Medicine

Shear (geology)

International Journal of Damage Mechanics

Through characterizing the interaction of normal/shear stress–strain behavior on material planes of TC4 alloys, a new strain energy critical plane model describing mean stress effects is proposed for life prediction under tension–compression, pure torsion, and tension–torsion loadings. Moreover, a modified Ince–Glinka model is elaborated through considering crack surface close to the maximum shear strain plane. Three simple solutions are presented to determine cracking failure mode using the concepts of life, damage, and strain. Comparing with lifing models of Liu, Smith–Watson–Topper, and modified Ince–Glinka, the proposed model provides more accurate life predictions for TC4 and a compressor turbine disc by full-scale fatigue testing.

Strain energy-based multiaxial fatigue life prediction under normal/shear stress interaction