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Cyclic stretching of three collagen fibrils followed by final loading to failure, demonstrating fibril strengthening upon cyclic loading at high strains. Final loading to failure after a. 20 loading cycles in regime I (fibril diameter: 197 nm), b. two series of 10 loading cycles in regime II (fibril diameter: 157 nm), and c. two series of 10 loading cycles in post-regime II (fibril diameter: 100 nm).
