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Crack Autodesk 3ds Max 9 32 Bit

Stress concentration in materials is a common issue in various load-bearing structures as it is linked to a potential mechanical failure. Thus, unnecessary cut-outs or contaminating inclusions are typically to be avoided, as externally applied forces will (re)distribute around the obstacles, reaching potentially critically high stress values at their edges [23]. For instance, formerly square-shaped airplane windows, which have caused fatal accidents by crack initiation at the corners, crack propagation, and eventually fatigue of the fuselage [24], are now generally of oval shape. In some cases, however, certain geometries acting as stress concentrators are built in devices by purpose, e.g., v-shaped cuts in tear-open packages, or are researched to create aligned surface patterns [25], to grow nanowires [26], or to fabricate master molds for nanofluidics [27]. These examples indicate that stress concentration, if implemented in the design of devices, may allow for realizing distinct device functions.

crack autodesk 3ds max 9 32 bit

One key aspect to realizing the sequential release function is the practical realization of a coating layer that fulfills the requirements of a thickness of only a few micrometers (compare Figure 4), initial non-permeability, and, by its structure, support for crack initiation/propagation. As the coating cannot be applied over empty cavities, the introduction of the payloads needed to be integrated into the overall coating concept. Hence, each cavity was carefully filled using dissolved dyes mixed with poly(ethylene glycol) (PEG) via microinjection under microscopic control. The selection of PEG as filler was based on (i) the possibility to tailor the viscosity of the payload mixture depending on PEG molecular weight and (ii) good aqueous solubility, while other types of fillers may be selected as long as they do not hinder cavity deformation by local strain. Successful cavity filling via the strategy employed here was confirmed by optical microscopy (Figure 5A).

Loading and coating of devices. (A) Top view on cavities exemplarily filled with fluorescein dye by microinjection. (B) SEM analysis of a cross-section of a coated circular cavity. The sample was stretched before preparation for SEM analysis. (C) Scheme of inhomogeneous, globular PBCA coating structure at its bottom surface that may support crack initiation and propagation.


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