Fatigue Damage Due to Sub-Threshold Load Cycles Between Periodic Overloads

Z Zhou; FJ Zwerneman

doi:10.1520/STP15076S

SYMPOSIA PAPER Published: 01 January 1993

STP15076S

Fatigue Damage Due to Sub-Threshold Load Cycles Between Periodic Overloads

Source

Overloads separated by below-threshold minor cycles are applied to ASTM A588 steel specimens. Fatigue crack propagation data were recorded and acoustic emission (AE) signals were monitored throughout each test. Estimates of crack growth based on a linear summation are less than experimentally observed rates, even when below-threshold cycles are conservatively assumed damaging. Acoustic emission data provide additional evidence that below-threshold cycles within a variable amplitude load history contribute to fatigue damage. The intensity of the AE signals increases with the number of minor cycles between overloads, even though all minor cycles are below the threshold stress intensity.

Author Information

Zhou, Z

Research and Development, Digital Logging, Inc., Tulsa, OK

Zwerneman, FJ

Oklahoma State University, Stillwater, OK

Shipping & Handling

Domestic Shipping

Domestic orders are delivered via United Parcel Service (UPS) or United States Postal Service (USPS). Transit times average 3 to 5 business days. Please be aware that UPS will not deliver packages to Post Office Boxes.

Domestic Rush Orders

Please Contact Us.

International Standard Shipping

International orders are delivered via courier post services which can be either a postal service, courier service, or a combination of both. Standard Service is untraceable. Please allow 4-7 weeks for delivery.

International Expedited Shipping

Please Contact Us.

Please be aware that carriers will not deliver packages to Post Office Boxes. Because of the variability of customs processes and procedures in different countries, ASTM International cannot guarantee transit times to international destinations. Customs duty and taxes are the responsibility of the consignee.

Shipping & Handling charges follow the rate schedule, below:

Order Total	Shipping & Handling Fee (US Domestic)
Up to $50.00	$18.72
$50.01 to $100.00	$20.80
$100.01 to $150.00	$29.52
$150.01 to $250.00	$39.09
$250.01 to $500.00	$56.25
$500.01 to $750.00	$76.42
$750.01 to $1000.00	$93.15
$1000.01 to $1500.00	$121.27
$1500.01 to $2500.00	$158.38
$2500.01 to $4999.00	$209.04
$5000.00 to higher	FREE

Order Total	Shipping & Handling Fee (International)
Up to $50.00	$68.72
$50.01 to $100.00	$70.80
$100.01 to $150.00	$79.52
$150.01 to $250.00	$89.09
$250.01 to $500.00	$106.25
$500.01 to $750.00	$126.42
$750.01 to $1000.00	$143.15
$1000.01 to $1500.00	$171.27
$1500.01 to $2500.00	$208.38
$2500.01 to $4999.00	$259.04
$5000.00 to higher	FREE

Shipping and Handling charges are approximate. Additional charges may be incurred if your order requires multiple shipments. This does not apply to complete sets and sections.

Reprints and Permissions

Reprints and copyright permissions can be requested through the
Copyright Clearance Center

Details

Developed by Committee: E08

Pages: 45–53

DOI: 10.1520/STP15076S

ISBN-EB: 978-0-8031-5255-7

ISBN-13: 978-0-8031-1874-4

Fatigue Damage Due to Sub-Threshold Load Cycles Between Periodic Overloads

Author Information

Related

Reprints and Permissions

Details