Bevelled adherend

Beveled lap joints. These joints are also more efficient than plain lap joints. The beveled edges allow conformance of the adherends during loading, with a resultant reduction of cleavage stress at the ends of the joint. 

Fig. 3. (a) By rotating the coordinate reference frame, normal stresses and shear stresses vary, obeying Mohr s circle, a graphical transformation technique for analyzing second-order tensors. Here are illustrations for uniaxial tension and pure shear, (b) Illustration of how average normal and shear stresses across a bondline vary with angle in a beveled joint. Results are normalized with respect to the nominal stress, oo = PI Ao, the load divided by the cross-sectional area of the adherends. 

THE EFFECT OF ADHEREND SHAPE—SCARFED, BEVELLED AND STEPPED ADHERENDS... 

It may be useful to the reader to consider as an example the work by Adams et al (1978c) and some of their hitherto unpublished results. They used finite-element methods to examine the stresses in high-performance composites in symmetrical lap joints with parallel, bevelled, scarfed and stepped adherends. The composite adherends were assumed to be linearly elastic type II carbon fibre reinforced epoxy composites with a 60% fibre volume fraction. The mechanical properties of this material are given in Table 3. 

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