DTIC ADA221775: Cyclic Stress Strain Behavior of pdf

DTIC ADA221775: Cyclic Stress Strain Behavior of

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The cyclic stress-strain behavior of powder-processed titanium containing 0.4 to 6.0 volume percent rounded porosity has been examined at room temperature. Total strain-range testing at small amplitudes such as 0.375% indicates that porosity has little influence on the cyclic hardening/softening response. However, at large total strain ranges such as 1.5% the cyclic flow behavior of the porous materials differs from that of fully dense titanium, behaving similarly to the pore-free material cycled at significantly higher strain amplitudes. The differences in cyclic flow behavior are believed to be a result of the locally large strain amplitudes induced adjacent to the pores. Determination of the cyclic strain-hardening exponents indicate no significant effect of porosity with n-values ranging from 0.24 to 0.28 for all of the materials examined. (JG

• Creator/s: Defense Technical Information Center
• Date: 4/1/1989
• Year: 1989
• Book Topics/Themes: DTIC Archive, Gerard, D A, PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING, *STRESS STRAIN RELATIONS, *CYCLES, *POROSITY, *TITANIUM, FATIGUE, POWDER METALLURGY, FLOW, AMPLITUDE, HARDENING, POROUS MATERIALS, PLASTIC FLOW, CASTINGS, HIGH DENSITY, RESPONSE, ROOM TEMPERATURE, SOFTENING, STRAIN HARDENING

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