What question did this study set out to answer?

The research aims to enhance predictions of crack initiation in fusion reactor components under severe multiaxial loading.

A refined energy-based multiaxial fatigue rule up to crack initiation: a case study for an in-vessel component subjected to complex combined loads

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Randomized trial applies a new fatigue rule predicting crack initiation in fusion reactor components, suggesting improved design safety.

The research aims to enhance predictions of crack initiation in fusion reactor components under severe multiaxial loading.
Applied a modified multiaxial fatigue rule to EUROFER97 Shielding Liner support, tailored to its geometry.
Evaluated the baseline approach against fatigue life requirements to assess prediction accuracy.
Introduced a new formulation utilizing total accumulated strain energy density amplitude for improved predictions.
The modified approach yielded less conservative predictions compared to the baseline fatigue rule.
Further experimental validation is needed to confirm robustness and applicability of the new method.
Preliminary insights indicated that constant strain level margins can lead to non-uniformity in energy density margins.

Villani et al. (2026) studied this question.

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