Spiral crack patterns observed for melt-grown spherulites of poly(L-lactic acid) upon quenching Futoshi Matsuda, Takamasa Sobajima, Satoshi Irie and Takashi Sasaki Eur. Phys. J. E, 39 4 (2016) 41 Published online: 19 April 2016 DOI: 10.1140/epje/i2016-16041-6