Electric Hydraulic Hybrid Motor Coupling

Final report and team photo for Project 05 of ME450, Fall 2010 semester.The Xebra is a pure electric vehicle that has a limited range. Rather than add more batteries to increase the range, a hydraulic launch assist and regenerative braking system will be added to minimize electrical consumption. The objective is to design, procure and install a mechanical coupling system between the electric motor, hydraulic pump/motor, and wheels.David Swain (USEPA)http://deepblue.lib.umich.edu/bitstream/2027.42/86236/1/ME450 Fall2010 Final Report - Project 05 - Electric Hydraulic Hybrid Motor Coupling.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/86236/2/ME450 Fall2010 Team Photo - Project 05 - Electric Hydraulic Hybrid Motor Coupling.jp

Experimental determination of the stress-crack opening relation in fibre cementitious composites with a crack-tip singularity

A J -based-fracture-testing method is presented for determining the bridging-stress-crackopening-displacement (σ-δ) relationship in fibre-reinforced composites where the crack-tip toughness is not negligible. The J -based technique originally proposed for concrete has been well-established for cementitious composites where the fracture process is primarily dominated by the formation of a fracture-process zone and the contribution of the crack-tip toughness is negligibly small. In this study, the J -based technique is further extended to cover materials for which the crack-tip stress singularity coexists with the fracture-process zone. This extended version of the J -based technique explicitly accounts for the crack-tip singularity while considering the fracture-process zone. This newly derived testing technique has been applied to a high-strength-mortar (HSM) reinforced with carbon and steel fibres where the fibrebridging toughness can be of the same order of magnitude as the crack-tip toughness. The validity of the σ-δ relationships deduced has been examined by comparing with results obtained from direct uniaxial tension tests. It is suggested that the J -based-fracture-testing technique can provide reasonable σ-δ relationships and fracture parameters in a fibrereinforced HSM.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/44728/1/10853_2004_Article_BF00356823.pd