Interfacial shear strength estimates of NiTi-Al matrix composites fabricated via ultrasonic additive manufacturing

2014 ◽  
Author(s):  
Adam Hehr ◽  
Joshua Pritchard ◽  
Marcelo J. Dapino
Keyword(s):  
Shear Strength ◽  
Additive Manufacturing ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Matrix Composites ◽  
Ultrasonic Additive Manufacturing ◽  
Al Matrix Composites ◽  
Al Matrix

Thermomechanical Behavior of Low CTE Metal-Matrix Composites Fabricated Through Ultrasonic Additive Manufacturing

2012 ◽  
Author(s):  
Ryan Hahnlen ◽  
Marcelo J. Dapino
Keyword(s):  
Shear Strength ◽  
Additive Manufacturing ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Large Strain ◽  
Matrix Composites ◽  
Interface Shear ◽  
Mechanical Coupling ◽  
Ultrasonic Additive Manufacturing

Shape memory and superelastic NiTi are often utilized for their large strain recovery and actuation properties. The objective of this research is to utilize the stresses generated by pre-strained NiTi as it is heated in order to tailor the CTE of metal-matrix composites. The composites studied consist of an Al 3003-H18 matrix with embedded NiTi ribbons fabricated through an emerging rapid prototyping process called Ultrasonic Additive Manufacturing (UAM). The thermally-induced strain of the composites is characterized and results show that the two key parameters in adjusting the effective CTE are the NiTi volume fraction and prestrain of the embedded NiTi. From the observed behavior, a constitutive composite model is developed based constitutive SMA models and strain matching composite models. Additional composites were fabricated to characterize the NiTi-Al interface through EDS and DSC. These methods were used to investigate the possibility of metallurgical bonding between the ribbon and matrix and determine interface shear strength. Interface investigation indicates that mechanical coupling is accomplished primarily through friction and the shear strength of the interface is 7.28 MPa. Finally, using the developed model, a composite was designed and fabricated to achieve a near zero CTE. The model suggests that the finished composite will have a zero CTE at a temperature of 135°C.

scholarly journals Hi-NicalonTM Fiber-Reinforced CVI-SiC Matrix Composites: II Interfacial Shear Strength and Its Effects on the Flexural Properties

2002 ◽  
Vol 43 (10) ◽  
pp. 2574-2577 ◽  
Author(s):  
Wen Yang ◽  
Hiroshi Araki ◽  
Akira Kohyama ◽  
Yutai Katoh ◽  
Quanli Hu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Flexural Properties ◽  
Matrix Composites ◽  
Fiber Reinforced

Direct measurement of fiber bridging in notched glass-ceramic-matrix composites

2006 ◽  
Vol 21 (5) ◽  
pp. 1150-1160 ◽  
Author(s):  
Konstantinos G. Dassios ◽  
Costas Galiotis
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Ceramic Matrix Composites ◽  
Interfacial Shear ◽  
Matrix Composites ◽  
Fiber Failure ◽  
Laser Raman ◽  
Notch Length ◽  
The Difference ◽  
Bridging Fibers

A novel, high-resolution remote Raman microscope was used for the direct in situ assessment of deformation on bridging fibers in a double-edge-notched SiC-Nicalon reinforced ceramic-glass matrix composite at various stages of monotonic tensile loading. The effect of notch length on the bridging strain profiles obtained by individually probing a large number of fibers across the bridged ligament of the composite was investigated. Bridging strain measurements in the microscale are used to identify the role and sequence of the failure micromechanisms developing within the bridging zone and are compared with their macromechanically derived counterparts. The difference of 25% in failure strain between the as-received fiber and the maximum value obtained on composite-fibers through laser Raman microscopy (LRM), is attributed to the different patterns of fiber failure in composites as compared to the techniques used for fibers characterization such as monofilament and bundle testing in air. This article demonstrates how the LRM-strain data can be utilized to obtain a direct, microscale measure of the interfacial-shear strength of the composite. The obtained interfacial shear strength (ISS) value of 7 MPa compares well with the macromechanically predicted value and offers a much higher precision compared to other experimental techniques.

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