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Educators, researchers, and policy makers have advocated student involvement for some time as an essential aspect of meaningful learning. In the past twenty years engineering educators have implemented several means of better engaging their undergraduate students, including active and cooperative learning, learning communities, service learning, cooperative(More)
magnification of four-bar mechanisms. The handout outlined a technique for performing such analyses using principles of energy conservation, geometry, and algebra. The technique is called 'instant-center analysis' and is based on a concept called 'virtual work.' The handout also contained an example analysis for a four-bar mechanism of a similar type to a(More)
This paper examines the largely ignored process of analytic problem solving. By applying learning theory to different problem-solving situations, we determine what factors contribute to a positive learning environment. An ideal environment includes facilities to observe the problem states simply and easily, and guidance in abstracting the observations into(More)
The Mode I and II stress intensity factors (K " K n) at the two tips of a subsurface crack subjected to a moving compressive load are studied. Coulomb friction along the crack faces results in a number of history dependent slip-stick configurations and nonsymmetric variation in K 7 and K /7. The formulation used to study this variation involves a singular(More)
Recent data suggest that the United States is unable to meet the demand for individuals well prepared to contribute to science, math, and engineering with their native workforce. Low participation rates of females and underrepresented minorities in these fields are major factors contributing to this situation. This study tracked the progress of the high(More)
The mechanism of spoiling failure in rolling contact is modeled by an elastic half-plane with a subsurface crack parallel to the surface, loaded by a compressive normal force which moves over the surface. Coulomb friction at the crack faces reduces the Mode II Stress Intensity Factors and results in a number of history-dependent slip-stick configurations.(More)
A solution is given for the elastic stress field in a half plane containing a plane crack parallel to the surface and subjected to a uniform normal pressure and a concentrated normal load. Frictional slip according to Coulomb's law is permitted between the crack faces. As the load is increased, a slip zone originates and grows either from a crack tip or(More)
The curvature function method for two-dimensional shape optimization under stress constraints is developed. This method uses curvatures along the boundary curve as the design variables. First it is shown that local curvature has a monotonic relation to stress. Based on this, a zero-order search direction can be defined to search for the optimum curvature(More)
The ubiquitous eutectic tin-lead (Sn-Pb) solder alloys are soon to be replaced with lead-free alternatives. In light of this transition, new computational tools for predicting the fatigue life of lead-free solders are required. Stress-strain, creep and isothermal fatigue data are generated for the 95.5Sn-3.9Ag-0.6Cu (wt.%) solder alloy; the latter generated(More)