Measurement of residual stresses in polymeric parts by indentation method

Pak, Seong Yeol; Kim, Seong Yun; Kim, Sung Hoon; Youn, Jae Ryoun

doi:10.1016/j.polymertesting.2013.04.011

Cited by 18 publications

(7 citation statements)

References 28 publications

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“…For most polymeric parts, residual stresses are quantified by destructive methods such as layer removal and hole drilling [86]. Although these techniques have problems related to their accuracy, their major drawback is reusing the measured parts.…”

Section: Mold Stress-relief Distortionmentioning

confidence: 99%

Application and Suitability of Polymeric Materials as Insulators in Electrical Equipment

et al. 2021

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In this paper, the applications of thermoplastic, thermoset polymers, and a brief description of the functions of each subsystem are reviewed. The synthetic route and characteristics of polymeric materials are presented. The mechanical properties of polymers such as impact behavior, tensile test, bending test, and thermal properties like mold stress-relief distortion, generic thermal indices, relative thermal capability, and relative thermal index are mentioned. Furthermore, this paper covers the electrical behavior of polymers, mainly their dielectric strength. Different techniques for evaluating polymers’ suitability applied for electrical insulation are covered, such as partial discharge and high current arc resistance to ignition. The polymeric materials and processes used for manufacturing cables at different voltage ranges are described, and their applications to high voltage DC systems (HVDC) are discussed. The evolution and limitations of polymeric materials for electrical application and their advantages and future trends are mentioned. However, to reduce the high cost of filler networks and improve their technical properties, new techniques need to be developed. To overcome limitations associated with the accuracy of the techniques used for quantifying residual stresses in polymers, new techniques such as indentation are used with higher force at the stressed location.

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Section: Mold Stress-relief Distortionmentioning

confidence: 99%

Application and Suitability of Polymeric Materials as Insulators in Electrical Equipment

et al. 2021

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“…Accurate excimer laser layer removal measurements are needed to verify the predicted residual stress distributions. In 2013, Pak et al [18] studied an indentation method as a method to measure the residual stress in injection molded polymer samples because the destructive methods limit the reuse of measured parts, and it is impossible to apply destructive methods to small and complex parts. By comparing the results of the load-displacement curve with the indentation depth, the residual stress distribution of the injection molded part could be calculated.…”

Section: Literature Reviewmentioning

confidence: 99%

Using Recognizable Fuzzy Analysis for Non-Destructive Detection of Residual Stress in White Light Elements

Chang

Mao

et al. 2021

Applied Sciences

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The phenomenon of residual stress in optical lens injection molding affects the quality of optical devices, with the refractive errors that are caused by geometric errors being the most serious, followed by the reduced accuracy and function of optical components; it is very important to ensure that the lens geometry remains intact and that the refractive index is reduced. This paper uses a photoelastic stress compensation method for measurement verification along with fuzzy theory to reorganize a set of processes that can be used to evaluate the residual stress of a product, whereby the use of corresponding theoretical formulas can effectively quantify and measure the residual stress of the product. A mold flow simulation is used to analyze the molded optical components and determine the feasibility of evaluating the quality of the lens. Through the measurement of the refractive stress value of the optical components, the molding quality of the lens can be improved, and its force distribution effects can be investigated. Geometric analysis and shear stress affect the performance of optical components, and these errors may also cause irreparable problems during secondary processing. Therefore, it is crucial to reduce the residual stress of optical components. When the stress distribution is uniform and the internal melting pressure is reasonably configured, the product’s shrinkage rate can be controlled; the method for determining the residual stress is the core theme of this research.

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“…Residual stress can be measured using methods such as hole drilling, indentation, X‐ray diffraction, and micro‐Raman spectroscopy. [ 1,3,4 ] However, these methods are difficult to use in practical applications, especially when real‐time measurement of residual stress change is required.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the piezoresistive behavior of carbon nanotube/polymer composites during stress relaxation

Shim

Jeon

2022

Polymer Composites

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Measurement of residual stresses in polymeric parts by indentation method

Cited by 18 publications

References 28 publications

Application and Suitability of Polymeric Materials as Insulators in Electrical Equipment

Application and Suitability of Polymeric Materials as Insulators in Electrical Equipment

Using Recognizable Fuzzy Analysis for Non-Destructive Detection of Residual Stress in White Light Elements

Modeling of the piezoresistive behavior of carbon nanotube/polymer composites during stress relaxation

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