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SMTnet Express, August 16, 2018, Subscribers: 31,259, Companies: 11,015, Users: 25,092

Technical Library

Reliable Young's Modulus Value of High Flexible, Treated Rolled Copper Foils Measured by Resonance Method

Kazuki Kammuri, Atsushi Miki, Hiroki Takeuchi; JX Nippon Mining & Metals

Smartphones and tablets require very high flexibility and severe bending performance ability of the flexible printed circuits (FPCs) to fit into their thinner and smaller body designs. In these FPCs, the extraordinary highly flexible, treated rolled-annealed (RA) copper foils have recently used instead of regular RA foil and electro deposited foils. It is very important to measure the Young's moduli of these foils predicting the mechanical properties of FPCs such as capabilities of fatigue endurance, folding, and so on. Even though the manufacturers use IPC TM-650 test method for measuring Young's modulus of copper foils over many years, where Young's modulus is calculated from the stress���strain (S���S) curve, it is quite difficult to obtain the accurate Young's modulus of metal foils by this test method.

Forum search results for related keywords: copper foil, FPC, fatigue.

SMT / PCB Products



GPD Global



Hand Assembly

Virtual Industries


SlingShot Assembly

Pick & Place

Count On Tools

Solder Paste Stencils

BEST, Inc.


BTU International







Vi Technology




PDR America


Kurtz Ersa





SMT / PCB Equipment Auctions

Online SMT Auction
Featuring Items From FryMaster

September 3 - 6 | Baja Bid

Electronic Equipment Mart


Screen Printing Equipment

ECM Equipment Sales, Inc.

Universal Genesis GX-11S

Pick and Place Equipment/Feeders

Capital Equipment Exchange

Mydata MY9 Only 5000USD

Pick and Place Equipment/Feeders

KD Electronics Ltd.

Mirtec MV-7U AOI

AOI / Automated Optical Inspection

IBE SMT Equipment

Asymtek C-740

Adhesive Dispensing Equipment

Baja Bid

Vitronics XPM 520N

Reflow Ovens

LEL Semi

Events Calendar

IPC E-Textiles 2018 Conference | September 13 | IPC

SMTA International 2018 Conference & Exhibition | October 14 - 18 | SMTA

PCB Cleaning Webinar Series | ZESTRON Corporation

Training Courses

IPC Training & Certification Courses

Soldering & PCB Rework Courses

Career Center

Assembler 2 ��� IPC 620


Oldsmar, FL | Lockheed Martin Corporation

SMT Field Service / Technical Support


Duluth, GA | Seika Machinery, Inc.

Commission Sales


Everywhere | SMTnet

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

Metcal CV-5200 Connection Validation Soldering System

Quality Pre-Owned SMT Eequipment - Robo-Tek

Experience the Blackfox Difference - Premier IPC Training & Certification Center

3 YEAR WARRANTY ��� Industry first, market leading warranty on all award winning TruView X-Ray inspection products from Creative Electron

Europlacer iineo+ SMT pick and place with integrated component tester

Online SMT Auction - Sept.3-6

Kyzen Free PCB Cleaning Audit

Why Use Plasma Treatment Prior To Conformal Coating. Download the 'The Effects of Plasma Treatment Prior to Conformal Coating' White Paper.

Speedprint SP700avi inline SMT screen printer

KIC - Making Reflow Ovens Smarter

Discover the Next Generation of Electronics Inspection - Join the YXLON EVOlution

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

NEW Fully featured benchtop dispenser - GPD Global

Vacuum Tweezers - pick up small components with ease

HELLER - Choose an Oven for Your Reflow Needs

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