The Wedge‐Loaded Double Cantilever Beam Test: A Friction Based Method for Measuring Interlaminar Fracutre Properties in Ceramic Matrix Composites

Mansour, Rabih; Manigandan, K.; Morscher, Gregory N.; Abdi, Frank; Godines, Cody; DorMohammadi, Saber

doi:10.1002/9781119407270.ch27

Cited by 5 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equilibrium condition of the vertical forces acting on the wedge, assuming symmetry, yields an equation for F x which is the mouth opening load (the load required to initiate and propagate an interlaminar crack) as follows:

F_{normalx} = P \frac{(cos α - μ sin α false)}{2 (sin α + μ cos α)}

To calculate the mouth opening load from Equation , the coefficient of friction between the specimen and the wedge should be determined. The coefficient of friction, μ , between SiC/SiC and Si 3 N 4 (wedge material) was measured in a previous work (using pin on disk) and was found to be 0.26 …”

Section: Methodsmentioning

confidence: 94%

“…For the wedge test, one may have to account for friction effects between the wedge and the specimen, which might require an additional procedure for determining the coefficient of friction . Also, alignment (specifically, specimen notch alignment in respect to the wedge) requires more attention in the wedge‐loaded DCB test compared to the traditional DCB.…”

Section: Traditional Dcb Vs Wedge‐loaded Dcb: Merits and Limitationsmentioning

confidence: 99%

See 1 more Smart Citation

Mode I interlaminar fracture behavior of 2D woven ceramic matrix composites

Mansour

Morscher

2018

Int J Applied Ceramic Tech

Self Cite

View full text Add to dashboard Cite

Interlaminar fracture properties of melt-infiltrated woven SiC/SiC ceramic matrix composites were investigated using traditional and wedge-loaded double cantilever beam methods. The two methods produced comparable G IC results for some specimens. The difference in boundary conditions between the two methods appeared to influence the crack propagation path. The DCB method, having free-end boundary condition, allowed more interaction between the crack and the composite microstructure than the wedge method did. The effect of fiber tow layout sequence had an effect on the interlaminar properties. Higher toughness was observed for the orientation where crack propagation occurs between planes with more transverse tows. Jump-arrest phenomenon was found to have higher significance on the rising R-curve behavior than fiber bridging. K E Y W O R D Sceramic matrix composites, crack growth resistance, fracture mechanics/toughness, R-curve

show abstract