Fracture and Structural Integrity

🔗 https://doi.org/10.3221/IGF-ESIS.77.23

🤔 Fatigue remains the primary cause of structural failure in mechanical components during service. Predicting exactly when and where surface-hardened parts will fail under cyclic loads has historically been a complex engineering challenge.

💡A recent study introduces an accurate predictive model using the local fatigue limit approach. By integrating microhardness profiles, residual stress distributions, and external stress states, this framework predicts the bending fatigue limit and crack initiation depth for surface-hardened, carburized, and nitrided components with less than 10% error.

🗞️ Want to optimize your heat treatments and maximize component service life? Read the full paper to discover how to implement this reliable predictive approach into your structural design strategy.

🔗 https://doi.org/10.3221/IGF-ESIS.77.17

🤔 Joining advanced thermoplastic composites like PEEK reinforced with short carbon fibers often results in weak interfaces. Traditional flat anvils fail to provide localized heating, frequently leading to uneven fusion and structural degradation.

💡New research reveals that using a spherical anvil in ultrasonic welding focuses frictional heat, fundamentally improving joint formation. Surprisingly, complete melting of the energy director is not necessary; a 100 μm thickness applied for 800 ms yields cohesive lap shear strengths over 11 MPa without damaging the base material.

🗞️ Discover how optimizing anvil shapes and energy director thickness can revolutionize composite manufacturing for the aerospace and automotive industries. Read the full paper to explore these microstructural breakthroughs!