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← ScienceWhich outcome accelerates fatigue fracture adjacent a fastener?
A)Galvanic corrosion weakens grain boundaries
B)Stress concentration exceeds material strength✓
C)Hydrogen embrittlement reduces ductility locally
D)Creep deformation redistributes stress unevenly
💡 Explanation
Stress concentration accelerates fatigue near holes or fasteners used in joining parts, because tensile loading amplifies at the geometric discontinuity; therefore cracks initiate rapidly rather than uniform damage, influenced by load and geometry under cyclic stress.
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