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ASTM International, 02/01/2013
Publisher: ASTM
File Format: PDF
$41.00$83.00
Published:01/02/2013
Pages:27
File Size:1 file , 410 KB
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1.1 This test method covers the determination of time for a creep crack to grow on initial load (CCI) and its subsequent creep crack growth (CCG) rates in metals at elevated temperatures using pre-cracked specimens subjected to elevated temperatures under static or quasi-static loading conditions. The tests are validated for either base material (homogenous properties) or mixed base/weld material with inhomogeneous microstructures and creep properties. For CCI the time (CCI), t0.2 to an initial crack extension δai = 0.2 mm from the onset of first applied force and CCG rate, a˙ or da/dt are expressed in terms of the magnitude of creep crack growth relating parameters, C* or K. With C* defined as the steady state determination of the crack tip stresses derived in principal from C*(t) and Ct (1-14).2 The crack growth derived in this manner is identified as a material property which can be used in modeling and life assessment methods (15-25).
1.1.1 The choice of the crack growth correlating parameter C*, C*(t), Ct, or K depends on the material creep properties, geometry and size of the specimen. Two types of material behavior are generally observed during creep crack growth tests; creep-ductile (1-14) and creep-brittle (26-37). In creep ductile materials, where creep strains dominate and creep crack growth is accompanied by substantial time-dependent creep strains at the crack tip, the crack growth rate is correlated by the steady state definitions of Ct or C*(t) , defined as C* (see 1.1.4). In creep-brittle materials, creep crack growth occurs at low creep ductility. Consequently, the time-dependent creep strains are comparable to or dominated by accompanying elastic strains local to the crack tip. Under such steady state creep-brittle conditions, Ct or K could be chosen as the correlating parameter (8-14).
1.1.2 In any one test, two regions of crack growth behavior may be present (9, 10). The initial transient region where elastic strains dominate and creep damage develops and in the steady state region where crack grows proportionally to time. Steady-state creep crack growth rate behavior is covered by this standard. In addition specific recommendations are made in ASTM Section 14:2010 ASTM Book of Standards - Section 14 - General Methods and Instrumentation (Vols 14.01-14.04) $100.00 $201.50 Add to Cart ASTM D5026-15 Standard Test Method for Plastics: Dynamic Mechanical Properties: In Tension $21.00 $42.00 Add to Cart ASTM F2579-10 Standard Specification for Amorphous Poly(lactide) and Poly(lactide-co-glycolide) Resins for Surgical Implants $32.00 $65.00 Add to Cart ASTM D7113/D7113M-10 Standard Test Method for Density of Bituminous Paving Mixtures in Place by the Electromagnetic Surface Contact Methods $26.00 $52.00 Add to Cart
ASTM Book of Standards - Section 14 - General Methods and Instrumentation (Vols 14.01-14.04)
$100.00 $201.50
Standard Test Method for Plastics: Dynamic Mechanical Properties: In Tension
$21.00 $42.00
Standard Specification for Amorphous Poly(lactide) and Poly(lactide-co-glycolide) Resins for Surgical Implants
$32.00 $65.00
Standard Test Method for Density of Bituminous Paving Mixtures in Place by the Electromagnetic Surface Contact Methods
$26.00 $52.00
