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Testing Metals Physical Strength & Performance |
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| 12th October, 2008 | |||||||||
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Perryman Co. Envisions a Better Way to Tensile and Shear Test Titanium; Tinius Olsen Makes it Happen
Specialty metal requirements are tricky enough to address, but especially so when a company is collaborating with a vendor. Such was the case recently for Perryman Company, a Houston, PA-based global specialty titanium products provider, who worked closely with Tinius Olsen, the Horsham, PA-based supplier of materials testing machinery and systems, on some specialized testing challenges. Perryman’s products are used in the aerospace, automotive, medical, and recreational industries.
(...) Wallace-Kuhl & Associates, Inc. (WKA) is a premier professional services firm that performs environmental and ecological support, geotechnical engineering, construction testing and inspection. The company, founded in 1984, now employs a staff of 200, including environmental scientists, geologists, engineers, technicians, and support personnel. Wallace-Kuhl & Associates has three offices in the greater California Central Valley, located in Yolo County, Placer County, and San Joaquin County.
It is rare today to find a product that can truly withstand the test of time. Yet in one Florida testing lab, Tinius Olsen has been a constant presence for nearly 54 years. More surprising, the Tinius Olsen materials testing machines used in that facility are nearly as old as the business itself. Wingerter Laboratories in North Miami is a very modern company that runs with more than a little nostalgia.
After an extended period in which the nation witnessed the closure of many of its major steel mills, it has been reassuring to witness the evolution of investor-owned Claymont Steel (Claymont, DE), which has grown from a start-up carbon plate mini mill following a late 2006 IPO to become the leading producer of custom-order discrete steel plate in the United States, Canada, and Mexico. This Cinderella tale is being written by an investor group, management team, and mill operators who fully understand the steel industry, are familiar with the needs of the marketplace, and are driven to provide top quality products and superior customer service within the niche of custom plate.
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Check List for Greater Accuracy of Test Results for Charpy Impact Testing 
One of the most common tests of the physical characteristics of metals is the notched Charpy impact test as specified by ASTM E23 Standard Test Method for Notched Bar Impact Testing of Metallic Materials. In simple terms the test places a specimen, horizontally, at the center of a set of support anvils and a striker on a pendulum then strikes, and breaks, the specimen. The energy absorbed by the specimen in the breaking process is known as the breaking energy and can be converted into an indication of a materials impact resistance using such units as foot-pounds or joules. While use of the data generated from a test for designing a part is not necessarily recommended, it still provides reasonable service as a quality control tool. For some materials, the results of these kinds of impact tests, when correlated with temperature variations and service experience, can help to accurately predict the likelihood of brittle fracture. Sample Preparation ASTM E23 allows for four types of Charpy specimen, namely un-notched, notched type A, notched type B or notched type C. The most common specimen is notched type A. Notching Specimens In order to do a notched Charpy test, a precise notch must be cut into the specimens. The purpose of the notch is to serve as a stress concentrator.
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