Chih-Hung Chen

TL;DR: In this article, the authors test resistive force theory in experiments on macroscopic swimmers in a fluid that is highly viscous so the Reynolds number is small compared to unity, just as for swimming microorganisms.

TL;DR: Code implementing the slender body, regularized Stokeslet, and resistive force theories is presented, thus readers can readily compute force, torque, and drag for any bacterium or nanobot driven by a rotating helical flagellum.

TL;DR: In this paper, a two-dimensional theory for predicting arbitrary paths of ultra-high-speed cracks was developed, which incorporates elastic nonlinearity without extraneous criteria, and showed that cracks undergo an oscillatory instability controlled by small-scale, near crack-tip, elastic non-linearity.

TL;DR: The results demonstrate that the bifurcation from propagating a planar to segmented crack front is strongly subcritical, reconciling previous theoretical predictions of linear stability analysis with experimental observations and show that facet coarsening is a self-similar process driven by a spatial period-doubling instability of facet arrays.

TL;DR: In this article, the authors conducted experiments and numerical simulations to investigate supersonic cracks and found that both experiments and simulations support the existence of subsonic cracks, and they discovered a transition from subsonics to supersonics as they plot experimental crack speed curves vs. extension ratio for different sized samples.