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Offset yield point (proof stress) When a yield point is not easily defined on the basis of the shape of the stress-strain curve an offset yield point is arbitrarily defined. The value for this is commonly set at 0.1% or 0.2% plastic strain. [14]
Alternatively, if the yield stress, , is assumed to be at the 0.2% offset strain, the following relationship can be derived. [5] Note that n {\displaystyle n} is again as defined in the original Ramberg-Osgood equation and is the inverse of the Hollomon's strain hardening coefficient .
ZERON 100 plate is included in the ASTM A240 specification. Its minimum room temperature mechanical property requirements are 109,000 psi [751 MPa] (ultimate tensile strength), 80,000 psi [552 MPa] (0.2% offset yield strength) and 25% minimum elongation. Zeron 100 has a copper addition which provides good resistance to sulfuric acid. For this ...
Yield strength (0.2% offset, ksi) Tensile strength (ksi) Elongation in 2 inches (percent) Hardness (Brinell scale) Comments Copper (ASTM B1, B2, B3, B152, B124, R133) Cu 99.9 Annealed 10 32 45 42 Electrical equipment, roofing, screens Cold-drawn 40 45 15 90 Cold-rolled 40 46 5 100 Gilding metal (ASTM B36) Cu 95.0, Zn 5.0 Cold-rolled 50 56 5 114
English: Illustration of offset yield point. Key: 1: True elastic limit 2: Proportionality limit 3: Elastic limit 4: Offset yield strength, usually defined at e=0.2% σ: Engineering stress ε: Engineering strain A: Undeformed cross-sectional area F: Uniaxial load L: Undeformed length l: Elongation
Ultimate tensile strength 285 MPa 41,300 psi Yield strength (0.2% offset) 285 MPa 41,300 psi Impact strength 58.0 J 42.8 ft-lbf Elongation at fracture 14% Shear strength 214 MPa 31,000 psi Compressive yield strength 414 MPa 60,000 psi Fatigue strength (reverse bending 5x10 8 cycles) 47.0 MPa 6,820 psi Hardness 80 Brinell Physical properties
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Tensile yield strength is the stress at which the bolt will yield in tension across the entire section of the bolt and receive a permanent set (an elongation from which it will not recover when the force is removed) of 0.2% offset strain. Proof strength is the usable strength of the fastener.