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Tensile Test Report, 2013

The EPCO bow and stern eyes are designed for mooring boats in accordance with ABTC H-40.3 and are not intended for lifting boats. The tensile strength of the 304 and 316 series stainless steel used in the production of these products is an important consideration for designers when selecting what style, diameter and material is to be used in their product.

EPCO engaged the Indiana Purdue University, Fort Wayne, Indiana to conduct tests and report its findings as to the point of failure that was obtained while doing two different tests. The tests consisted of a straight pull tensile test (Figures 1 & 2) and an edge pull (Figures 3 & 4). The tests were conducted from December 28, 2012 to February 11, 2013.

Tests were performed on randomly selected samples of both 304 and 316 series stainless steel bow eyes. Fixtures for each series of tests were fabricated by the university to accommodate the tensile and edge pull on the bow eyes. Copies of material certifications were provided with the test samples. Testing was conducted on a 400,000 lb Tinius Olson machine (certified calibration on 06-03-2009).

Figure 1 Tensile Test Figure 2 Bow Eye Tensile Failure
Figure 3 Edge Pull Figure 4 Bow Eye Edge Failure

The representative sample products of the 304 and 316 series stainless steel that were tested were EPCO part numbers:

  • 151 (.625” diameter – cut thread)
  • 113 (.500” diameter – cut thread)
  • 164 (.446” diameter – rolled thread)
  • 123 (.331” diameter – rolled thread)
Failure Loads for Bow Eyes
Tensile (lbs) TYPE 151 113 164 123
  304 50,600 30,704 32,000 17,690 
  316 47,400  25,700 30,200 17,760
Edge (lbs) TYPE 151 113 164 123
  304 20,400 18,600 11,190 10,940
  316 18,570 14,990 14,340 10,630

Test Results certified by:
Iskander Hack, PE
Department Chair,
Mechanical and Structural Engineering Technology
PE 19500056

IPFW
Indiana University/Purdue University
2101 E. Coliseum Blvd.
Fort Wayne, IN 46805-1499
260-481-6812

*Complete Test Report (PDF)

 

Tensile Test Report, 2003

EPCO's bow and stern eyes are designed for mooring boats in accordance with ABYC H-40.3 and are not intended for lifting boats. The tensile strength of the 304 and 316 series stainless steel used in the production of these products is an important consideration for designers when selecting what style, diameter and material that is used in their product.

EPCO engaged a major midwestern university to conduct tests to report its findings as to the points of failure that were obtained while doing three different tests. The tests were done on a straight pull tensile test (Figures 1 & 2 Tensile Test), an edge pull (Figures 3 & 4 Edge Pull) and a side pull (Figures 5 & 6 Side Pull). The tests were conducted from June 10 - August 18, 2003.*

The tests were done on randomly selected production samples of both 304 and 316 series stainless steel bow eyes. Fixtures for each series of tests were fabricated at the university to accommodate tensile, side pull, and edge pull on the bow eyes. Copies of material certifications were provided with the test samples.

 

Figure 1 Tensile Test Figure 2 Bow Eye Tensile Failure
Figure 3 Edge Pull Figure 4 Bow Eye Edge Failure
Figure 5 Side Pull Figure 6 Side Pull Failure

The representative samples of 304 and 316 series stainless steel that were tested were EPCO part numbers:

  • 151 5/8" diameter—cut thread
  • 113 1/2" diameter—cut thread
  • 164 .446" diameter—roll thread
  • 123 .331" diameter—roll thread
Failure Loads for Bow Eyes—August 27, 2003
Tensile (lbs) TYPE 151 113 164 123
  304 47,000  31,400  31,900  18,000 
  316 36,300  28,800  29,900  16,800 
Edge (lbs) TYPE 151 113 164 123
  304 18,400  18,900  11,200  7,500 
  316 21,100  21,000  14,500  11,200 
Side (lbs) TYPE 151 113 164 123
  304 6,400  3,900  10,600  6,000 
  316 32,300  3,400  3,500  11,700 

June 10, 2003 - August 18, 2003

Test Conclusion
"Tensile tests results and edge pull test results correlate to expectations of material behavior for a single test situation. Side pull tests are not as conclusive, even with a second series of tests. However, with an appropriate factor for safety, side pull results can be used." —quote from test report on August 27, 2003

*Complete Test Report (PDF)

Statement of Compliance
All the products that EPCO produces meet or exceed the requirements for that product as defined by
ABYC H-40 (PDF).