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By introducing a concept of thermal expansion (TE) of a Josephson junction asan elastic response to an effective stress field, we study (both analyticallyand numerically) the temperature and magnetic field dependence of TEcoefficient $\alpha $ in a single small junction and in a square array. Inparticular, we found that in addition to {\it field} oscillations due toFraunhofer-like dependence of the critical current, $\alpha $ of a small singlejunction also exhibits strong flux driven {\it temperature} oscillations near$T_C$. We also numerically simulated stress induced response of a closed loopwith finite self-inductance (a prototype of an array) and found that $\alpha $of a $5\times 5$ array may still exhibit temperature oscillations provided theapplied magnetic field is strong enough to compensate for the screening inducedeffects

Thermal expansion of Josephson junctions as an elastic response to an effective stress field