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SMTnet - where else would you meet over 500,000 industry professionals? 2019 PCB Cleaning Webinars - SMT, THT, and semiconductor learning opportunities

SMTnet Express, March 7, 2019, Subscribers: 31,716, Companies: 10,725, Users: 25,814

Technical Library

Effect of Encapsulation Materials on Tensile Stress during Thermo-Mechanical Cycling of Pb-Free Solder Joints

Credits: DfR Solutions

Electronic assemblies use a large variety of polymer materials with different mechanical and thermal properties to provide protection in harsh usage environments. However, variability in the mechanical properties such as the coefficient of thermal expansion and elastic modulus effects the material selection process by introducing uncertainty to the long term impacts on the reliability of the electronics. Typically, the main reliability issue is solder joint fatigue which accounts for a large amount of failures in electronic components. Therefore, it is necessary to understand the effect of polymer encapsulations (coatings, pottings and underfills) on the solder joints when predicting reliability.

This paper presents the construction and validation of a thermo-mechanical tensile fatigue specimen. The thermal cycling range was matched with potting expansion properties in order to vary the magnitude of tensile stress imposed on solder joints

Forum search results for related keywords: solder joints fatigue, tensile stress.

SMT / PCB Products


Assembly Services

SlingShot Assembly




GPD Global


Nordson Asymtek

Hand Assembly

Virtual Industries

Pick & Place

Count On Tools





Seika Machinery






ASC International

Solder Paste Stencils

BEST, Inc.





Vi Technology



SMT / PCB Equipment Auctions

Consolidated Assets from Pioneer Magnetics, Omega Engineering, On Ramp Wireless and Others

Including: Pillarhouse, Agilent & more...

March 4 - 5 | X-Line Asset Management

Electronic Equipment Mart

Mydata TP9-2

Pick and Place/Feeders

LEL Semi

Koh Young Zenith LiTE Advanced 3D AOI - NEW 2018!

AOI / Automated Optical Inspection

Capital Equipment Exchange

Speedline Electrovert Aquastorm 50 Batch Cleaner

Board Cleaners

IBE SMT Equipment

PCB Conveyors


JMW Enterprises

Speedprint SP700AVI

Screen Printers

X-Line Asset Management



KD Electronics Ltd.

Events Calendar

Webinar: Stencil Design for Solder Paste, In Process Inspection & Process Defects | March 18 | SMTA

IPC High Reliability Forum | May 14 - 16 | IPC

PCB Cleaning Webinar Series | ZESTRON Corporation

Training Courses

IPC Training & Certification Courses

Soldering & PCB Rework Courses

Career Center

Field Service - Robotic Soldering Systems


Kenosha, WI | PROMATION, Inc.

Urgently required: Jobs In Nashik


Nashik, India | Paramount Enterprises

SMT Operator


Bourne, MA | Onset Computer Corp.

Industry Associations Events


SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies.

Membership Info | SMTA Certification | Bookstore | Upcoming Events


IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly.

Membership Info | Training & Certification | Online Store | Upcoming Events

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.


Used PCB Assembly Equipment - CE Exchange

Hioki 1240 Flying Probe Tester - ultra-high speed measuring, fine pitch inspection.

Kyzen Free PCB Cleaning Audit

Dual Applicators for Non-Atomized Conformal Coating Improve High-Volume Manufacturing

Unused Equipment? - let BajaBid turn your EXCESS ASSETS into cash!

Nitrogen Capable SMD & BGA Rework Station

NEW Fully featured benchtop dispenser - GPD Global

Turn-Key PCB Prototypes - On Your Bench in 5 Days - Rework Tools

Vacuum Tweezers - pick up small components with ease

HELLER - Choose an Oven for Your Reflow Needs

KIC - Making Reflow Ovens Smarter

3D SPI, 3D AOI, 3D AXI - Seamless inspection, and testing solution - TRI

Quality Pre-Owned SMT Eequipment - Robo-Tek

Used SMT Equipment - IBE

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