Measurements are presented from a two-beam structure with several bolted interfaces in order to characterize the nonlinear damping introduced by joints. The measurements (all at force levels below macroslip) reveal that each underlying mode of is well approximated single degree-of-freedom (SDOF) system mechanical joint. At low enough levels, show dissipation scales as second power applied force, agreeing theory for linear viscously damped system. This attributed viscous behavior material...

ABSTRACT For care‐experienced young people, the preparation for leaving out‐of‐home care (OOHC) is vital in support of post‐OOHC outcomes. This research explores acquisition Independent Living Skills (ILS) amongst people Western Australia and based on interviews with at two time points: while OOHC after OOHC. Overall, 72% participants were female, 45% had a disability identified as Aboriginal and/or Torres Strait Islander. Total years spent ranged from 2 to 16 years. study adopts methods;...

Iwan models have had some exposure recently in modeling the nonlinear response of individual joints. This popularity can be ascribed to their mathematical simplicity, versatility, and ability capture important responses mechanical joints under unidirectional loads. There is a lot history this category model. Masing explored kinematic hardening metals with model consisting ten Jenkins elements series. Soon after, Prandtl behavior continuous distribution such elements. Ishlinskii structure...

A nonlinear Maxwell fluid model consisting of a linear dashpot in series with parallel arrangement spring and second-order spring, was developed. This configuration provides the flexibility necessary to describe both stiffening softening responses some viscoelastic materials. noteworthy feature is that under constant rate displacement, force equation can be solved closed form, thereby providing continuous, exact general solution.

The generalized momentum balance (GMB) methods, explored chiefly by Shabana and his co-workers, treat slap or collision in linear structures as sequences of impulses, thereby maintaining the linearity throughout. Further, such analysis is facilitated modal representation structures. These methods are discussed here extended. Simulations on a simple two-rod problem demonstrate how this impulse approximation affects system both directly after each well over entire collision. Furthermore, these...

Using fine material meshes in structural dynamics analysis is often impractical due to time step considerations. Unfortunately, are typically required capture the inherent physics jointed connections. This especially true threaded connections which feature numerous contact interfaces and stress singularities. A systematic method presented here for representing volume by a continuous, homogeneous, linear elastic, anisotropic equivalent material. The parameters of that depend on thread...

The Lubkin solution for two spheres pressed together and then subjected to a monotonically increasing axial couple is examined numerically. Deresiewicz asymptotic compared the full its utility evaluated. Alternative approximations are suggested compared. One approximation Padé rational function which matches analytic over all rotations. other an exponential that reproduces values of at infinitesimal infinite Finally, finite element solutions problem with exact approximate solutions.

Abstract Sandia National Laboratories (SNL) has completed a comparative evaluation of three design assessment approaches for 2-liter (2L) capacity containment vessel (CV) novel plutonium air transport (PAT) package designed to survive the hypothetical accident condition (HAC) test sequence defined in Title 10 United States (US) Code Federal Regulations (CFR) Part 71.74(a), which includes 129 meter per second (m/s) impact into an essentially unyielding target. CVs hazardous materials...

Measurements are presented from a two-beam structure with several bolted interfaces in order to characterize the nonlinear damping introduced by joints. The measurements (at force levels below macro-slip) reveal that each underlying mode of is well approximated single degree-of-freedom system mechanical joint. At low enough show dissipation scales as second power applied force, agreeing theory for linear viscously damped system. This attributed viscous behavior material and/or provided...

Correctly incorporating the influence of mechanical joints in built-up systems is a critical element for model development structural dynamics predictions. Quality experimental data are often difficult to obtain and rarely sufficient determine fully parameters relevant mathematical models. On other hand, fine-mesh finite (FMFE) modeling facilitates innumerable numerical experiments at modest cost. Detailed FMFE analysis structures with frictional interfaces reproduces trends among problem...