SPE Library
The SPE Library contains thousands of papers, presentations, journal briefs and recorded webinars from the best minds in the Plastics Industry. Spanning almost two decades, this collection of published research and development work in polymer science and plastics technology is a wealth of knowledge and information for anyone involved in plastics.
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Failure Analysis and Prevention
Dynamic Mechanical Analysis
Jeffrey Jansen, June 2019
Dynamic Mechanical Analysis (DMA) is a thermoanalytical technique that measures the stiffness (modulus) and damping (tan delta) of polymeric materials to assess the viscoelastic properties as a function of time, temperature, and frequency. Polymeric materials display both elastic and viscous behavior simultaneously, and DMA can separate these responses. Polymers, composed of long molecular chains, have unique viscoelastic properties, which combine the characteristics of elastic solids and Newtonian fluids. As part of the DMA evaluation, a small deformation is applied to a sample in a cyclic manner. This allows the material’s response to stress, temperature, and frequency to be studied. The analysis can be in several modes, including tension, shear, compression, torsion, and flexure. DMA is a very powerful tool for the analysis of plastics and can provide information regarding:
- Modulus
- Damping
- Glass Transition
- Softening Temperature
- Creep Behavior
- Stress Relaxation
- Degree of Cure
Thermal Analysis in Failure and Compositional Analysis
Jeff Jansen, December 2018
SPE Webinar Series - Thermal Analysis in Failure and Compositional Analysis, presented by Jeff Jansen on December 6, 2018. Thermal analysis is an important group of tests used in the analysis of plastics and other polymeric materials. It consists of a family of well-established techniques that evaluate material properties as they change with temperature, time, and ambient environment under conditions of thermal programming. The results of thermal analysis tests provide qualitative and quantitative information about the material being evaluated. In particular, this information is important to address plastic failures or in characterization of the material composition and physical properties. The webinar on thermal analysis will introduce the four primary techniques:
- Differential Scanning Calorimetry (DSC)
- Thermogravimetric Analysis (TGA)
- Thermomechancial Analysis (TMA)
- Dynamic Mechanical Analysis (DMA)
Ductile to Brittle Transitions in Plastics
Jeff Jansen, October 2018
Goals: To address questions that arise regarding plastic component failure:
- Why do I experience sudden unexpected failure in my plastic components?
- Why do the properties of my plastic parts change?
- Why do I get brittle failures in my ductile material?
Wear of Plastics
Jeffrey A. Jansen, June 2018
Goal: To address questions that arise regarding wear within plastic components
- What causes plastic parts to wear?
- What is friction, and how is it different than wear?
- Can I test my material to predict wear?
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