Abstract
In this research, the prevalent mode fracture of V-notches with end holes (VO-notch) in tungsten–copper functionally graded material (W–Cu FGM) was studied experimentally and theoretically. W–Cu FGM specimens were made by powder metallurgy technique in the experimental part. Several fracture tests were done on VO-notched W–Cu FGM specimens under prevalent mode loading for different notch tip radii and notch depths. To predict the fracture loads of VO-notched FGM specimens under prevalent mode loading, the averaged strain energy density over a well-defined control volume was applied in the theoretical section. Moreover, the effect of notch tip radius, notch depth and notch opening angle on the fracture loads was investigated. This study shows that strain energy density theory works well on VO-notched FGM specimens under prevalent mode loading.
Highlights
V, U, VO- and keyhole-notches are different types of notches which exist in structural elements
This study shows that strain energy density theory works well on VO-notched functionally graded material (FGM) specimens under prevalent mode loading
The fracture load of VO-notch specimens fabricated of WCu FGM under the prevalent mode II was predicted using averaged strain energy density criterion
Summary
V-, U-, VO- and keyhole-notches are different types of notches which exist in structural elements. One of the most important advantages of this criterion is that the averaged value of strain energy density over the control volume can be computed with high accuracy by finite element approach using the low number of elements [5, 6] Other applications of this criterion are considering the T-stress and three-dimensional effects, assessing uniaxial and multiaxial fatigue failure of welded joins and notched members [7, 8] and investigating different loading modes. One of the main groups of advanced material is functionally graded material (FGM), in which the spatial chemical properties change gradually to achieve the specific features Various techniques such as the bulk (particulate processing), preform processing, layer processing and melt processing can be employed to fabricate these materials. Fracture behavior of WCu functionally graded material weakened by different kind of notches has been studied in Refs.
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