Chattopadhyay, S., & Qu, J., & Nuri, A., & Hasan, S. A., & Kundu, N. (2017, June), Torsion Tests to Study Plastic Deformation in Ductile Materials  Paper presented at 2017 ASEE Annual Conference & Exposition, Columbus, Ohio. 10.18260/1-2--29032

\bibitem{asee_peer_29032}
  Chattopadhyay, S., \& Qu, J., \& Nuri, A., \& Hasan, S. A., \& Kundu, N. (2017, June), \emph{Torsion Tests to Study Plastic Deformation in Ductile Materials}
  Paper presented at 2017 ASEE Annual Conference \& Exposition, Columbus, Ohio.
  10.18260/1-2--29032

Somnath Chattopadhyay, Jerry Qu, Adres Nuri, Syed Ali Hasan, and Nilanjan Kundu.  "Torsion Tests to Study Plastic Deformation in Ductile Materials".  2017 ASEE Annual Conference & Exposition, Columbus, Ohio, 2017, June.  ASEE Conferences, 2017.  https://peer.asee.org/29032 Internet.  13 Jan, 2025

\bibitem{asee_peer_29032}
  Somnath Chattopadhyay, Jerry Qu, Adres Nuri, Syed Ali Hasan, and Nilanjan Kundu.
  "Torsion Tests to Study Plastic Deformation in Ductile Materials".
  \emph{2017 ASEE Annual Conference \& Exposition, Columbus, Ohio, 2017, June}.
  ASEE Conferences, 2017.
  https://peer.asee.org/29032 Internet.  13 Jan, 2025

@INPROCEEDINGS{asee_peer_29032
author = "Somnath Chattopadhyay, Jerry Qu, Adres Nuri, Syed Ali Hasan, and Nilanjan Kundu"
title = "Torsion Tests to Study Plastic Deformation in Ductile Materials"
booktitle = "2017 ASEE Annual Conference \& Exposition"
year = "2017"
month = "June"
address = "Columbus, Ohio"
publisher = "ASEE Conferences"
note = {https://peer.asee.org/29032}
number = {10.18260/1-2--29032}
}

TY  - CPAPER
AB  - This project is an experimental study on plastic deformation in ductile materials such as aluminum and steel.  The object is to stimulate interest in engineering undergraduate students the importance of plasticity in structural design and metal forming.  It is proposed as a supplemental lab activity for the junior level Mechanics of Materials course. Torsion tests were performed on circular cylindrical bars to obtain torque-twist curves (the torsional shear stress vs torsional shear strain plots).  The shear modulus, G, and the 0.2% offset yield shear strength, k, were estimated from these curves.  The bars were twisted well into their plastic regions, and as the elastic/plastic torsion continued, the torques seemed to approach their limiting values.  Experimental estimates for the limiting torques were in reasonable agreement with the values predicted by the so-called sand heap analogy. This states that the stress surface for a fully plastic cross-section is obtained by piling dry sand on a horizontal base whose shape is identical to the cross-section of the bar.  For a circular cross-section, the sand heap is a cone, and the limiting torque is equal to (k a /G) times the volume of the cone, where a is the radius.  
The specimens were twisted to a predetermined maximum value.  The directions of twist were subsequently reversed.  After unloading and reloading from the initial loading phase, the materials seemed to yield in the reverse direction with lesser yield strength values.  This shows that the plastic deformation for metallic materials is one direction affects plastic deformation in the reve

AU  - Somnath Chattopadhyay
AU  - Jerry Qu
AU  - Adres Nuri
AU  - Syed Ali Hasan
AU  - Nilanjan Kundu
CY  - Columbus, Ohio
DA  - 2017/06/24
PB  - ASEE Conferences
TI  - Torsion Tests to Study Plastic Deformation in Ductile Materials
UR  - https://peer.asee.org/29032
DO  - 10.18260/1-2--29032
ER  -