Deformation and failure under multiaxial stresses-a survey of laboratory techniques and experimental-data-by-W, J. Evans National Gas Turbine Establishment SUMMARY A survey has been made of techniques for producing multiaxial stress conditions on a laboratory scale and it is concluded that one of the more suitable systems is combined tension-torsion of thin-walled tubes. Experimentally this tec...

Collagen is a protein material with intriguing mechanical properties - it is highly elastic, shows large fracture strength and plays a crucial role in making Nature's structural materials tough. Collagen based tissues consist of collagen fibrils, each of which is composed out of a staggered array of ultra-long tropocollagen molecules extending to several hundred nanometers. Albeit the macroscop...

Carbon is one of the most important materials extensively used in industry and our daily life. Crystalline carbon materials such as carbon nanotubes and graphene possess ultrahigh strength and toughness. In contrast, amorphous carbon is known to be very brittle and can sustain little compressive deformation. Inspired by biological shells and honeycomb-like cellular structures in nature, we intr...

Abstract Brittle reactivation of plastic shear zones is frequently observed in geologically old terranes. To better understand such deformation zones, we have studied the >700 Ma long structural history Himdalen–Ørje Deformation Zone (HØDZ) SE Norway by K–Ar and 40 Ar– 39 Ar geochronology, characterization. Several generations mylonites make up ductile part HØDZ, Ørje Shear Zone. A white mic...

Introduction: The Iberian Pyritic Belt (IPB) consists of a 250-km long geological unit included into the South-Portuguese geotectonical zone of the Iberian Peninsula. It is comprised by an acid volcanosedimentary complex ranging in age from upper Devonian to Carboniferous where different metallic ores were formed in response to hydrotermalism and tectonic related to the Variscan Orogeny [1, 2]....

To evaluate the effect of yield stress on hydrogen embrittlement (HE) martensitic and ferritic steels, (H) capture by structural inhomogeneities (hydrogen traps) plastic deformation mechanism corrosion cracking (SCC) are considered. In presence hydrogen, brittle fracture high-strength steels consists flat areas intergranular at initial austenitic grain boundaries quasi-brittle cracks martensite...

Introduction: The first glacial deformations of an extraterrestrial ice sheet have been discovered and documented at the Martian south polar cap in Mars Orbital Camera (MOC) images [1-4]. Within the south polar cap various structural deformational features have been found, including boudinage, folds, and faults [1-2] (Fig. 1). These features are also found in terrestrial glaciers [5-7]. Mars pr...