Tensile. Yield.
Fatigue. Toughness.
Strength-driven.
Material selection for high-strength applications. UTS, yield, fatigue, toughness all matter. High-strength alloys often less ductile.
Key principles.
UTS 850-1000 MPa
Through-hardenable alloy steel. Good strength + toughness balance.
UTS 1300+ MPa
Higher strength than 4140. Aircraft landing gear, axles.
UTS 1900 MPa
Aerospace ultra-high-strength steel. Springs, fasteners.
UTS 2400 MPa
Highest strength steel. Aerospace, racing. Premium.
UTS 950 MPa
High strength + light weight. 50% steel density.
UTS 1240 MPa
High temperature + high strength. Aerospace turbines.
UTS 570 MPa
Highest aluminum strength. Aerospace structural.
UTS 100 MPa
Highest engineering plastic strength. Lightweight.
UTS 1500-3500 MPa
Composite strength along fiber direction. Aerospace, racing.
FAQ
Strength scaling with material?
Material yield strength: 7075 aluminum 500 MPa, 4140 steel 800 MPa, Ti-6Al-4V 880 MPa, 4340 steel 1300 MPa, maraging 2000+ MPa.
High-strength = brittle?
Generally yes. Tradeoff between strength and ductility. Maraging steels exception — high strength with reasonable ductility.
Static vs fatigue strength?
Fatigue limit ~50% UTS for steel, 30-40% for aluminum. Cyclic loading dominated by fatigue.
Heat treatment effect?
Major. Quench-tempered 4140: 2-3× annealed strength. Specify heat treat condition.
Strength-to-weight rankings?
Carbon fiber composites > Ti-6Al-4V > 7075 aluminum > 4140 steel. Weight matters? Composites/Ti win.
Notch sensitivity?
High-strength materials notch-sensitive. Stress concentrations critically important. Generous fillets, no sharp corners.
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