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Plastic Deformation in Circular Shafts

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...

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Related Experiment Video

Updated: Sep 10, 2025

Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste

Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste

Published on: July 18, 2025

From Circularity to Spirality: An Integrated, Systems-Level Approach to Address the Plastics Problem.

Patritsia M Stathatou^1,2, Christos E Athanasiou³, Matthew J Realff^1,2

¹School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Journal of the American Chemical Society

|August 26, 2025

Summary

This summary is machine-generated.

Plastic recycling faces challenges with quality degradation. A new "spirality" model acknowledges this, advocating for tiered strategies and early-stage assessments for sustainable polymer solutions.

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Area of Science:

Polymer Science and Engineering
Environmental Science and Policy

Background:

Plastics provide benefits but create environmental and health issues due to low recycling rates and fossil fuel dependence.
Current mechanical recycling limits material quality over cycles; advanced methods like chemical recycling present scalability and cost questions.

Purpose of the Study:

Introduce "spirality" as a realistic alternative to perfect circularity for plastics.
Advocate for integrating mechanical benchmarking, life cycle assessment (LCA), and techno-economic analysis (TEA) for evaluating recycling solutions.
Highlight the need for data and multidisciplinary collaboration for sustainable polymer transitions.

Main Methods:

Conceptual framework development (Spirality model).
Emphasis on early-stage integration of assessment tools (LCA, TEA, mechanical benchmarking).
Call for multidisciplinary collaboration across science, engineering, and policy.

Main Results:

Spirality acknowledges inevitable plastic quality degradation during recycling.
Tiered recycling strategies are necessary to manage this degradation.
Early and integrated assessment frameworks are crucial for evaluating new recycling technologies.

Conclusions:

Spirality offers a pragmatic approach to polymer end-of-life management.
Robust assessment frameworks and collaboration are key to achieving sustainable plastics recycling.
Innovation in polymer design and recycling must consider material degradation and tiered strategies.