Why should a joint sealant have adhesion only to the two opposite surfaces of a joint? Explain.
What will be an ideal response?
If the sealant adheres to the two opposite surfaces, it is only subjected to tension or compression. If it also adheres to the third (bottom) surface of the joint, it will be subjected to shear as well. Because the shear strength of a sealant is high, the sealant will suffer adhesive failure at the two opposite surfaces, which is a failure of the sealed joint. Note that there are only three surfaces in a sealed joint.
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What will be an ideal response?
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