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We study the influence of thermal fluctuations on the fracture of elasticnetworks, via simulations of the uniaxial extension of central-force springnetworks with varying rigidity, i.e. connectivity. Studying their failureresponse, both at the macroscopic and microscopic level, we find that anincrease in temperature corresponds to a more homogeneous stress(re)distribution and induces thermally activated failure of springs. As aconsequence, the material strength decreases upon increasing temperature, thedamage is spread over larger lengthscales and a more ductile fracture processis observed. These effects are modulated by network rigidity and can thereforebe tuned via the network connectivity and the rupture threshold of the springs.Knowledge of the interplay between temperature and rigidity improves ourunderstanding of the fracture of elastic networks, such as (biological) polymernetworks, and can help to refine design principles for tough soft materials.

The role of temperature in the rigidity-controlled fracture of elastic networks