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Stress concentrations can be created by _____ and ______ stiffness irregularities

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Final answer:

Stress concentrations can be created by thermal expansion or contraction and stiffness irregularities.

Step-by-step explanation:

Stress concentrations can be created by thermal expansion or contraction and stiffness irregularities.

In the case of thermal stress, it is created by the expansion or contraction of a material due to changes in temperature. This can lead to concentrations of stress in certain areas.

Stiffness irregularities can also create stress concentrations. When a structure has variations in stiffness, such as areas that are stiffer or more rigid than others, it can result in localized stress concentrations.

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