Dynamic compressibility, shear strength, and fracture behavior of ceramic microstructures predicted from mesoscale models

2012 ◽  
Author(s):  
John D Clayton ◽  
R Brian Leavy ◽  
Reuben H Kraft
Keyword(s):  
Shear Strength ◽  
Fracture Behavior ◽  
Mesoscale Models ◽  
Dynamic Compressibility

Microstructure Evolution and Mechanical Properties of the Ni/Ni Soldered Joints

2011 ◽  
Vol 172-174 ◽  
pp. 863-868
Author(s):  
Anna Sypień ◽  
Andrzej Piątkowski ◽  
Paweł Zięba
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Chemical Composition ◽  
Microstructure Evolution ◽  
Fracture Behavior ◽  
Bulk Solder ◽  
Subsequent Aging ◽  
Brittle Phase ◽  
Edx Microanalysis ◽  
Solder Interface

The paper presents the results of studies on the microstructure, chemical composition and mechanical properties of the Ni/SnAuCu/Ni interconnections obtained due to the conventional soldering at 300 °C for different times and subsequent aging at 150 °C. The EDX microanalysis allowed to detect at the Ni/solder interface the (Ni,Cu,Au)3Sn4phase which transformed to (Cu,Ni,Au)6Sn5after longer time of soldering. In the central part of the interconnection AuSn4brittle phase was present. This phase was responsible for the significant decrease of the shear strength in the joints subjected to aging at 150 °C for 1000h, 1500 hours. The fracture behavior of such joints appeared to be caused partly by the coalescence of the microvoids in the bulk solder, cleavage of η-phase grains and decohesion at the interface.

Shear strength and fracture behavior of solder/Kovar joints with electroplated Cu film

Vacuum ◽  
2019 ◽  
Vol 167 ◽  
pp. 428-437 ◽  
Author(s):  
Xiaowu Hu ◽  
Nifa Bao ◽  
Qinglin Li
Keyword(s):  
Shear Strength ◽  
Fracture Behavior ◽  
Cu Film

Shear Strength and Fracture Behavior of SiCw/Al2O3 Composite-Carbon Steel Brazed Joints

2005 ◽  
Vol 297-300 ◽  
pp. 2441-2446 ◽  
Author(s):  
Shi Yao Qu ◽  
Zeng Da Zou ◽  
Xin Hong Wang
Keyword(s):  
Shear Strength ◽  
Carbon Steel ◽  
Reaction Layer ◽  
Fracture Behavior ◽  
Filler Metal ◽  
Testing Machine ◽  
Al2o3 Composite ◽  
Close Relationship ◽  
Brazed Joints ◽  
Composite Carbon

Shear strength and fracture behavior of Al2O3 matrix ceramic composite brazed joints to carbon steel with Ag-Cu-Ti brazing alloy in flow argon have been studied by means of SEM, EDX and all-purpose testing machine. Results have shown that there is a close relationship between the shear strength and the fracture form of brazed joints. The fracture occurring completely in the composite near the composite/filler metal interface corresponds to the low strength of a joint, and the strength of the joint fractured partially in the composite usually increases with decreasing the proportion of the composite on the fracture surface in the steel side. When the fracture occurs in the reaction layer between the composite and the filler metal, the closer the fractured position comes to the composite/reaction layer interface, the higher the joint strength. The maximum shear strength is obtained when the fracture occurs fully at the interface.

Influence of Carbon Fiber Pre-Treatments on Interlaminar Shear Strength and Fracture Behavior of C/C Composites

2011 ◽  
Vol 686 ◽  
pp. 482-487
Author(s):  
Wan Chang Sun ◽  
He Jun Li ◽  
Qian Gang Fu ◽  
Shou Yang Zhang
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fracture Behavior ◽  
Fiber Surface ◽  
Interlaminar Shear Strength ◽  
Transmission Electron ◽  
Fracture Behaviors ◽  
Interlaminar Shear ◽  
Surface Morphologies

PAN-carbon fibers were pretreated using three methods. 2D-C/C composites were fabricated by a rapid chemical liquid-vaporized infiltration (CLVI) processing. Surface morphologies of carbon fiber pretreated and fracture micrographs of 2D-C/C composites were observed by scanning electron microscopy (SEM) and high resolution transmission electron microscope (HRTEM). The interlaminar shear strength(ILSS) of C/C composites was tested. The influences of carbon fiber surface pretreatments on ILSS and fracture behaviors of C/C composites were analyzed. The experimental results indicated that the C/C composite with carbon fiber coated CVI pyrocarbon possesses both higher flexural strength and interlaminar shear strength than composites with other fiber pretreatments. The fractographes revealed the differences in the mechanical behavior depending on the interface strength of fiber/matrix.

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