In-plane shear loading

Orient fibers in direction of loading For tensile and compressive loads along the axial direction of the cylinder, wind helical plies at the lowest possible angle to the shaft axis for in-plane shear loads align fibers at 45 to the shaft axis... 

The primary function of the face sheets is to provide the required bending and in-plane shear stiffness, and to carry the axial, bending, and in-plane shear loading (Chapter 8 BEAMS). In high-performance structures, facings most commonly chosen are BPs (usually prepreg), URPs, aluminum, titanium, or stainless steel. 

In-plane shear loading—kAherenA shear loads that produce shear stresses to the bondline in lap and strap joints. 

P(l) The notation to be used for an in-plane shear loaded double-lap joint is given in Figure 5.39. 

Figure 5.39 In-plane shear loaded double-lap joint.

P(3) In-plane shear loaded double-lap and double-strap joints shall be designed using the corresponding equations for tensile shear loaded joints and using the parameter conversions of Table 5.6. 

Table 5.6 Equivalent parameters for tensile shear and in-plane shear loadings.

Tensile shear loading In-plane shear loading... 

Hart-Smith (reference 5.26) has presented the situation where the joint is loaded by tensile or compressive and in-plane shear loadings simultaneously. Joint failure will occur when the bondline displacement resultant caused by these actions exceeds the capacity of the adhesive. If the tensile (compressive) loading develops a maximum bondline displacement of ta(yt,c)max and the shear loading induces an orthogonal displacement of ta(ys)max at the same end of the joint, the displacement at failure is ... 

The full characterization of a unidirectional composite under an in-plane shear load parallel to the fiber direction will entail the measurement of shear modulus G12, shear strength Fg and ultimate shear strain j/g. These can be determined by ... 

For in-plane shear loads, ahgn most fibers at 45° to these shear loads. 

Finally, it is noteworthy that, from (a) the results shown in Table 1 (where the value of Gc is shown to be independent of peel angle), (b) the above discussions on the CZM approach in Section 3.2, and (c) the good agreement between values of Gc from different geometries referred to directly above, there appears to be no need to invoke the proposition that the ratio of mode I mode 11 loading (i.e. tensile opening to in-plane shear loading) varies dramatically as the applied peel... 

It should be noted that the preceding representations are merely mathematical models enabling the analyses to extend beyond the earlier elastic solutions. The actual adhesive bonds do not yield in the classical ductile metal sense. What actually happens is that the adhesive fails under the tensile component of the applied combination of shear and peel stresses, as explained by Gosse [8]. The failure mode for the peel-dominated case is a simple single fracture surface parallel to the adherends which, once started, will not arrest. Under dominant in-plane shear loads, however, the failure mode is a series of hackles inclined at... 

Additional calculations of the strengthened structure are necessary to ensure that the strengthened structure will be able to withstand other actions, such as the increased in-plane shear loading, now transferred from the walls... 

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