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Case records and radiological investigations of six children with benign fibrous histiocytoma were studied retrospectively. BFH occurred in the femur (n = 2), tibia (n = 2) and fibula (n = 2). Clinically, patients reported pain from the lesion lasting several months (mean 6 months). The pain was not associated with pathological fracture in any patient. On X-rays, the lesions appeared as lytic and...
This report deals with the study of the plastic deformation processes of semi-crystalline polymers at the micrometric and nanometric scales by atomic force microscopy. Capturing images from the same locus of the sample as a function of strain allows in situ observation of the processes. New experimental findings regarding initiation, growth and coalescence of crazes in poly(1-butene) are reported...
Semicrystalline polymers exhibit different levels of microstructure: macromolecules, individual crystalline lamellae, stacks of lamellae separated by amorphous layers, spherulites. Due to such complexity, the understanding of their macroscopic mechanical behaviour requires study of the plastic deformation mechanisms which occur from the nanoscopic to the microscopic scale. We are interested here in...
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