RECENT PROGRESS OF CRACK BRIDGING MODELING OF DUCTILE-PHASE-TOUGHENED W-CU COMPOSITES

Book · Thu Apr 16 00:00:00 EDT 2015

OSTI ID:1179518

Setyawan, Wahyu; Henager, Charles H.; Wagner, Karla B.; Roosendaal, Timothy J.; Borlaug, Brennan A.; Kurtz, Richard J.; Odette, G Robert; Cunningham, Kevin; Zok, Frank W.

A crack bridging model using calculated Cu stress-strain curves has been developed to study the toughening of W-Cu composites. A strengthening factor and necking parameters have been added to the model for the ductile-phase bridges to incorporate constraint effects at small bridge sizes. Parametric studies are performed to investigate the effect of these parameters. The calculated maximum applied stress intensity, aKmax, to induce a 1-mm stable crack is compared to the experimental stress intensity at peak load, Kpeak. Without bridge necking, increasing the strengthening factor improves the agreement between aKmax and Kpeak when plotted vs. logarithm of the displacement rate. Improvement can also be achieved by allowing necking with a larger failure strain. While the slope is better matched with this latter approach, the calculated value of aKmax is significantly larger than Kpeak.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1179518
• Report Number(s): PNNL-SA-108116; AT2030110
• Resource Relation: Related Information: Fusion Reactor Materials Program Semiannual Progress Report for the Period Ending December 31, 2014, 57; DOE/ER-0313/57:113-119
• Country of Publication: United States
• Language: English