Digital speckle pattern interferometry (DSPI): A fast procedure to detect and measure vibration mode shapes

Digital Speckle Pattern Interferometry (DSPI) is an optical nondestructive testing method allowing the visualization of the defects or the deformations of an object submitted to static deformation or to vibration. This method can be applied to a lot of cases within a range of displacements between tens of nanometers and tens of micrometers. DSPI can be applied to detect the natural frequencies and to visualize the mode shapes of a vibrating object. It is very convenient to study small and weak objects because no contact is required compared to classical modal analysis using accelerometers. DSPI was successfully applied to study a cantilever aluminium plate (5 cm × 10 cm × 1 mm). The experimental isodisplacement fringe maps are compared to computational results using a finite element method.     

Destruction of chemical warfare agents VX and soman by α‐nucleophiles as oxidizing agents

Reactions of O‐ethyl S‐(2‐diisopropyl‐amino)ethyl methylphosphonothiolate, VX 1 , were investigated with five oxidizing agents. In all the cases, the formation of the VX N‐oxide 7 was observed prior to the subsequent oxidation and hydrolysis into the nontoxic O‐ethyl methylphosphonate 2. Magnesium monoperoxyphthalate (MMPP) is probably one of the most active reagents to achieve the complete detoxification of VX 1 . The decontamination using MMPP was also extended with success to soman 13 , a G‐type agent. © 2001 John Wiley & Sons, Inc. Heteroatom Chem 12:485–490, 2001     

Modelling and computation of acrylic bone cement injection and curing within the framework of vertebroplasty

This contribution deals with the simulation based investigation of processes related to the surgical treatment of vertebroplasty. In this regard, a simulation framework has been developed, which includes the generation of microstructural computer models of cancellous bone structures, the simulation of bone cement injection by computational fluid dynamics (CFD) methods and finite element (FE) simulations of bone cement curing processes. The modelling and computation strategy is illustrated and different material modelling approaches for the representation of acrylic bone cements as a non-linear fluid and a non-linear viscoelastic solid with curing dependent properties are outlined. (© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)