Multi-axis Substructure Testing System for Hybrid Simulation by Riadh Al-Mahaidi M. Javad Hashemi Robin Kalfat Graeme Burnett & John Wilson

Author:Riadh Al-Mahaidi, M. Javad Hashemi, Robin Kalfat, Graeme Burnett & John Wilson
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

2.32 mm bottom plate thickness and 20-mm-thick walls to distribute bearing stress.

3.Double bottom plate thickness in the center of the cruciform to reduce peak torsional stress.

4.Grade 420-MPa steel.

5.Curved stiffener plates to reduce stress concentrations at corners.

6.Holes in internal stiffener plates to reduce weight, resulting in a total weight of 9470 kg.

Design specifications and details of the crosshead are presented in Appendix Figures A.1 to A.3. Finite-element modeling for the crosshead was undertaken by building a 3-D model that reflected the geometries and material properties to be used in manufacture. The model included all relevant details, such as holes for base plate connections and stiffener plates. Zones of weakness at weld connections were considered by locally modeling elements of lower strength/stiffness in the vicinity of welds. The analysis was geometrically nonlinear.

Restraint was applied to the base plate of the crosshead by fixing the translation in the z-direction of the base plate. In addition, the perimeters of the holes were fixed in the x, y, z directions to reflect the restraining effects of the bolts. The appropriate load cases considered are outlined in Figs. 3.12 and 3.13. Two load cases were considered to induce the highest possible flexure and torsion within the structure. Note that in all figures that follow, the 32-mm machined bottom steel surface of the crosshead is shown topside for clarity. Compressive load was applied as a uniformly distributed load over the area of the loading plates in contact with the actuators. Tensile forces were applied to an area around each loading plate hole using the appropriate washer size.

Fig. 3.12MAST sample load case for maximum torsion

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