Xem 1-11 trên 11 kết quả Plasticity and failure
  • The ultimate responsibility for prudential standard-setting and supervision for Tier 1 FHCs must rest with a single regulator. The public has a right to expect that a clearly identifiable entity, not a committee of multiple agencies, will be answerable for setting standards that will protect the financial system and the public from risks posed by the potential failure of Tier 1 FHCs.

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  • There is a vast multitude of materials with strongly differing properties. A copper wire, for instance, can be bent easily into a new shape, whereas a rubber band will snap back to its initial form after deformation, while the attempt to bend a glass tube ends with fracture of the tube. The strongly differing properties are reflected in the application of engineering materials – you would neither want to build cars of glass nor rubber bridges. The multitude of materials enables the engineer to select the best-suited one for any particular component.

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  • In the past few decades, the Finite Element Analysis (FEA) has been developed into a key indispensable technology in the modeling and simulation of various engineering systems.

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  • The most popular of the rigid reinforcements for printed wiring boards is woven E-glass (electrical-grade glass) fabric. These fabrics are constructed to meet weight, thickness, strength, and cost objectives. The woven fabric is used in many industries as reinforcements for thermoplastic and thermosetting plastic parts. Thermosetting laminates are particularly enhanced by the properties of the glass fabric.

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  • Two years ago today, Bear Stearns was collapsing. In the time since, Americans have faced the worst financial crisis since the Great Depression. Millions have lost their jobs, businesses have failed, housing prices have dropped, and savings were wiped out. The failures that led to this crisis require bold action. We must restore responsibility and accountability in our financial system to give Americans confidence that there is a system in place that works for and protects them. We must create a sound foundation to grow the economy and create jobs....

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  • We are a group of dedicated material scientists each with 15–25 years of research and development experience in the assembly and interconnect technologies of electronics. Our experience in chemical and mechanical interfacial compatibility between dissimilar materials dates back to the end of the 1980s. Since the early 1990s with the rise of the electronics industry in Finland, we focused our work increasingly into the challenges of materials, assembly technologies and reliability of portable electronics.

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  • To approximate the effects of strain hardening, a flow stress cr0, taken to be an average of the yield and ultimate strengths, is often used when computing the plastic collapse stress. The plastic collapse stress ac is that applied stress which produces cr0 across the remaining uncracked ligament, and is the maximum applied stress that a perfectly plastic material can sustain. This stress may be determined using a limit load analysis. In general, the plastic collapse stress is a function of geometry, type of loading, type of support (boundary conditions), ...

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  • Farrell & Greacen (1966) and Greacen et al. (1968) calculated the pressure required to expand cavities in the soil by spherical and cylindrical deformation respectively. The advancing probe or root was accommodated by compression of the surrounding soil. This was assumed to occur in two distinct regions: an inner zone of compression with plastic failure immediately surrounding the probe, and a zone of elastic compression outside this.

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  • This is mainly applicable for short-lived devices where very large overloads may occur at low cycles. Typical examples include the elements of control systems in mechanical devices. A fatigue failure mostly begins at a local discontinuity and when the stress at the discontinuity exceeds elastic limit there is plastic strain. The cyclic plastic strain is responsible for crack propagation and fracture. Experiments have been carried out with reversed loading and

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  • Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture.In modern materials science, fracture mechanics is an important tool in improving the mechanical performance of materials and components.

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  • Structural analysis is the branch of mechanical engineering (and also civil engineering) devoted to examining why and how objects fail and to fix the objects and their performance. Structural failures occur in two general modes: static failure, and fatigue failure. Static structural failure occurs when, upon being loaded (having a force applied) the object being analyzed either breaks or is deformed plastically, depending on the criterion for failure. Fatigue failure occurs when an object fails after a number of repeated loading and unloading cycles.

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