Deniz Yalcin's blog
Mechanical Testing of Vascular Stents
With heart disease being the leading cause of death among adults in the United States, vascular stents are a critical medical device in ensuring patients live longer and healthier lives. There are a variety of stents that range in both size and strength for various applications. Mechanical testing of vascular stent involves testing the vascular stent specimens in various modes of failure including bending, torsion, tensile, crushing, abrasion, and fatigue. This blog post covers certain test types and the recommended equipment to test vascular stents.
Shear Testing Essentials
Shear testing produces shear property data for material specifications, research and development, quality assurance, and structural design and analysis. Shear properties can be calculated via different test types including tension, flexion, and compression as well as different test set ups such as the lap shear method, V-notched rail method, short beam method, and more. Click here for the original blog post.
Sheet Metal Tension Testing
Sheet metal forming operations consist of simple bending, to stretching to deep drawing of complex parts. The mechanical properties of the sheet material greatly influence its formability, which is a measure of the amount of deformation the material can withstand prior to fracture. This blog post covers important definitions determining sheet metal characteristics, the test methods, and the equipment used to quantify them.
Jaw Selection for Tensile Testing Grips
Tensile grip jaw selection plays an important role for successful mechanical tests as if specimen slippage between the jaws occurs or if the specimen breaks or tears in the jaw area testing may need to be discarded. This post covers the available jaw surface types for tensile grips and also the operation of quick-change type jaws.
Material Testing: Crucial Step in Bridge Development & Engineering Design
Bridge failures underscore the importance of rigorous material testing. The collapse of the incomplete pedestrian bridge at Florida International University on March 2018 is an example where design errors led to growing cracks as described by OSHA.
Although material failure is not the sole reason for bridge failures, it is a crucial step for selecting the right materials, bridge design analysis, and construction testing.
Load Calculator
In our industry, equipment, including universal testing machines and grips and fixtures, are categorized by the maximum force capacity. We have generated an automatic load calculator to help calculate the required forces necessary to test a certain type of material. The calculator can be found here: https://www.admet.com/calculators/load-calculator/
To use the calculator:
1- Select the specimen geometry. Options include: rectangular, round, tubular, by area.
Lüders Bands Phenomenon in ASTM E8 Tensile Testing
Some metals, particularly annealed low-carbon steel, or mild steel, show a discontinuity when transitioning from elastic to plastic deformation that produces the yield point phenomenon in the stress strain curve.
Wide Width Tensile Testing
Tensile testing is among the most standard tests performed by universal testing machines yet depending on how the test specimen is used in its native environment, setting up the tensile test method is not always straightforward. Wide width tensile testing is a type of tensile testing procedure used with specimens that are prepared with wider width than the standard tensile specimen coupons. This blog posts covers wide width tensile testing, standards outlining wide width testing methods, and the necessary equipment.