In this study, a test technique that enables continuous control of the sample stress state from freezing to testing is proposed investigate influence pressure on mechanical properties ice under uniaxial compression. method, water frozen into standard cylindrical specimen high hydraulic in triaxial chamber, and then, temperature field specimens are adjusted initial test; finally, an situ conduct...

We analyze three-dimensional finite coupled thermomechanical deformations of a rectangular plate with two parallel notches placed symmetrically about the horizontal centroidal plane of the plate. The edge surface of the plate between the two notches is struck by a cylindrical projectile of diameter equal to the distance between the notches and made of the same material as the plate. The plate m...

A mesh independent continuum damage model has been proposed to predict the residual strength of adhesively bonded joints by introducing a displacement-based damage parameter into the constitutive equation of damaged materials. Joints bonded with a ductile adhesive EA9321 were studied for a range of environmental degradation. The moisture dependent damage parameter for EA9321 was calibrated usin...

Few studies exist on the mechanical performance of crosslinked electrospun chitosan (CS) fibre mats. In this study, we show that the mat structure and mechanical performance depend on the different crosslinking agents genipin, epichlorohydrin (ECH), and hexamethylene-1,6-diaminocarboxysulphonate (HDACS), as well as the post-electrospinning heat and base activation treatments. The mat structure ...

Interfacial fracture toughness and cyclic fatigue-crack growth properties of joints made from 99.5% pure alumina partially transient liquid-phase bonded using copper/niobium/copper interlayers have been investigated at both room and elevated temperatures, and assessed in terms of interfacial chemistry and microstructure. The mean interfacial fracture toughness, Gc, was found to decrease from 39...

Bin Zhou, M. D. Thouless, and S. M. Ward Department of Mechanical Engineering Department of Material Science and Engineering University of Michigan Ann Arbor, MI, 48109 Scientific Research Laboratory Ford Motor Company Dearborn, MI, 48124 Abstract A methodology for determining the cohesive facture parameters associated with pull-out of spot welds is presented. Since failure of a spot weld by pu...

0020-7683/$ see front matter 2010 Elsevier Ltd. A doi:10.1016/j.ijsolstr.2010.07.010 * Corresponding author. Tel.: +1 617 386 3325. E-mail address: [email protected] (M. Luo). Advanced High Strength Steels (AHSS) are increasingly used in automotive industry due to their superior strength and substantial weight advantage. However, their compromised ductility gives rise to numerous manufacturing is...

The triaxiality of the stress state is known to greatly influence the amount of plastic strain which a material may undergo before ductile failure occurs. It is defined as the ratio of hydrostatic pressure, or mean stress, to the von Mises equivalent stress. This paper discusses the effects of stress triaxiality on yielding behavior of anisotropic materials. Hill-von Mises’s criteria for anisot...

Scratches are deleterious to precision optics because they can obscure and modulate incident laser light, which will increase the probability of damage to optical components. We here imitated the generation of brittle and ductile scratches during polishing process and endeavored to find out the possible influence of scratches on laser induced damage. Brittle scratches can be induced by spiking ...

This paper is part of an ongoing effort to develop a test methodology to examine the durability of surface mount interconnects under impact loading conditions. Literature indicates that as the drop height is increased, there is a transition in the failure site from the ductile solder to the brittle intermetallic or the copper traces. Not much work has been done to understand this phenomenon. Th...