Microstructural and mechanical characterization of melt spun process Sn-3.5Ag and Sn-3.5Ag-xCu lead-free solders for low cost electronic assembly

The main limitation of mechanical testing equipments is nowadays centred in the characterization of materials at medium loading rates. This is particularly important in bulk forming because strain rate can easily reach values within the aforesaid range. The aim of this article is twofold: (a) to present the development of a low-cost, flexible drop weight testing equipment that can easily and effectively replicate the kinematic behaviour of presses and hammers and (b) to provide a new level of understanding about the mechanical characterization of materials for bulk forming at medium rates of loading. Special emphasis is placed on the adequacy of test operating conditions to the functional characteristics of the presses and hammers where bulk forming takes place and to its influence on the flow stress. This is needed because non-proportional loading paths during bulk forming are found to have significant influence on material response in terms of flow stress. The quality of the flow curves that were experimentally determined is evaluated through its implementation in a finite-element computer program and assessment is performed by means of axisymmetric upset compression with friction. Results show that mechanical characterization of materials under test operating conditions that are similar to real bulk forming conditions is capable of meeting the increasing demand of accurate and reliable flow stress data for the benefit of those who apply numerical modelling of process design in daily practice.

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Synthesis and Characterization of Lead-Free Solders with Sn-3.5Ag-xCu (x=0.2, 0.5, 1.0) Alloy Nanoparticles by the Chemical Reduction Method

Journal of The Electrochemical Society ◽

10.1149/1.1954928 ◽

2005 ◽

Vol 152 (9) ◽

pp. J105 ◽

Cited By ~ 48

Author(s):

Li-Yin Hsiao ◽

Jenq-Gong Duh

Keyword(s):

Reduction Method ◽

Chemical Reduction ◽

Lead Free ◽

Synthesis And Characterization ◽

Alloy Nanoparticles ◽

Chemical Reduction Method ◽

Lead Free Solders

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Mechanical Properties of Natural-Fiber-Reinforced Biobased Epoxy Resins Manufactured by Resin Infusion Process

Polymers ◽

10.3390/polym12122841 ◽

2020 ◽

Vol 12 (12) ◽

pp. 2841 ◽

Cited By ~ 1

Author(s):

Mauricio Torres-Arellano ◽

Victoria Renteria-Rodríguez ◽

Edgar Franco-Urquiza

Keyword(s):

Epoxy Resins ◽

Mechanical Characterization ◽

Natural Fiber ◽

High Strain ◽

Low Cost ◽

Natural Fibers ◽

Fiber Reinforced ◽

Resin Infusion ◽

New Applications

This work deals with the manufacture and mechanical characterization of natural-fiber-reinforced biobased epoxy resins. Biolaminates are attractive to various industries because they are low-density, biodegradable, and lightweight materials. Natural fibers such as Ixtle, Henequen, and Jute were used as reinforcing fabrics for two biobased epoxy resins from Sicomin®. The manufacture of the biolaminates was carried out through the vacuum-assisted resin infusion process. The mechanical characterization revealed the Jute biolaminates present the highest stiffness and strength, whereas the Henequen biolaminates show high strain values. The rigid and semirigid biolaminates obtained in this work could drive new applications targeting industries that require lightweight and low-cost sustainable composites.

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Synthesis and Mechanical Characterization of Sisal-Epoxy and Hybrid-Epoxy Composites in Comparison with Conventional Fiber Glass-Epoxy Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.984-985.285 ◽

2014 ◽

Vol 984-985 ◽

pp. 285-290

Author(s):

K. Hari Ram ◽

R. Edwin Raj

Keyword(s):

Mechanical Strength ◽

Mechanical Characterization ◽

Natural Fiber ◽

Epoxy Composite ◽

Low Cost ◽

Glass Fibers ◽

Natural Fibers ◽

Impact Testing ◽

Natural Glass

Polymer composites reinforced with natural fibers have been developed in recent years, showing significant potential for various engineering applications due to their inherent sustainability, low cost, light weight and comparable mechanical strength. Sisal is a natural fiber extracted from leaves of Agave Sisalana plants and substituted for natural glass fiber. Six different combinations of specimens were prepared with sisal, sisal-glass and glass fibers with epoxy as matrix at two different fiber orientation of 0-90° and ±45°. Mechanical characterization such as tensile, flexural and impact testing were done to analyze their mechanical strength. It is found that the hybrid composite sisal-glass-epoxy has better and comparable mechanical properties with conventional glass-epoxy composite and thus provides a viable, sustainable alternate polymer composite.

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