About

Daniel Morris is a professor in the College of Liberal Arts at Purdue University, with affiliations in English, Jewish Studies, SIS, Film and Video Production, and the Rueff School. His research focuses on American literature, poetry, art, and drama, as well as Jewish American literature. He has contributed extensively to the fields of contemporary American poetry, poetics, and pedagogy, and has authored and edited numerous books and essays on these topics. His scholarly work includes a range of publications such as essays, interviews, and edited collections that explore the ongoing transformation of higher education, contemporary Jewish American photography, and the poetics of print literacy and new media. Morris has also written original poetry and has been involved in editing collections on humanistic cultural criticism and radical poetics. His contributions extend to analyzing modernist and contemporary literary figures, and he has a significant publication record that reflects his engagement with American literary and cultural studies.

Research topics

• Composite material
• Metallurgy
• Materials science
• Computer Science
• Structural engineering
• Mechanical engineering
• Engineering

Selected publications

• Retained austenite stability on rolling contact fatigue performance of 8620 case‐carburized steel

  Fatigue & Fracture of Engineering Materials & Structures · 2021 · 12 citations

  1st authorCorresponding
  • Materials science
  • Metallurgy
  • Composite material

  Abstract Varying levels of retained austenite (RA) were achieved through varying undercooling severity in uniformly treated case carburized 8620 steel. Specimens were characterized via XRD and EBSD techniques to determine RA volume fraction and material characteristics prior to rolling contact fatigue (RCF). Higher RA volume fractions did not lead to improvement in RCF lives. XRD measurements after RCF testing indicated that little RA decomposition had occurred during RCF. A continuum damage mechanics (CDM) finite element model (FEM) was then developed to investigate the effects of RA stability on RCF. The results obtained from the CDM FEM captured similar behavior observed in the experimental results. Utilizing the CDM FEM, a parametric study was undertaken to examine the effects of RA quantity, RA stability, and applied pressure on RCF performance. The study demonstrates that the energy requirements to transform the RA phase are critical to RCF performance.

  PublisherDOI

• Rolling contact fatigue study of chilled and quenched/tempered ductile iron compared with AISI 1080 steel

  Wear · 2021 · 11 citations

  • Materials science
  • Metallurgy
  • Composite material
  PublisherDOI

• Residual stress formation and stability in bearing steels due to fatigue induced retained austenite transformation

  International Journal of Fatigue · 2020 · 35 citations

  1st authorCorresponding
  • Computer Science
  • Materials science
  • Structural engineering
  PublisherDOI

• Predicting Material Performance in Rolling Contact Fatigue via Torsional Fatigue

  Tribology Transactions · 2019-03-21 · 18 citations

  article1st author

  Evaluating new materials for rolling element bearings (REBs) is an expensive, time-consuming, and difficult process. This work presents a continuum damage mechanics (CDM)-based finite element model (FEM) that incorporates gradual material degradation under cyclic loading and discrete material representation to predict rolling contact fatigue (RCF) failure. The fully reversed orthogonal shear stress was considered the critical stress for the CDM RCF modeling. Torsional fatigue results available from the open literature were used to determine the critical parameters for CDM FEM. In contrast to previous modeling approaches, in this investigation the CDM material parameters were considered probabilistic in nature to represent variations in material strength or resistance to fatigue. This modification to the modeling procedure resulted in RCF life predictions that capture life scatter characteristic of the RCF phenomena for REBs. Based on the model results, a fatigue life equation was developed to corroborate the Lundberg and Palmgren (LP) theory. The results obtained from the predictive life equation generated from the CDM-based FEM using material parameters obtained from torsional fatigue results are in good agreement with the LP model.

  PublisherDOI

• Effect of Residual Stresses on Microstructural Evolution Due to Rolling Contact Fatigue

  Journal of Tribology · 2018-05-21 · 18 citations

  article1st authorCorresponding

  Rolling contact fatigue (RCF) induces a complex subsurface stress state, which produces significant microstructural alterations within bearing steels. A novel modeling approach is presented in this paper, which investigates the effects of microstructural deterioration, phase transformations, and residual stress (RS) formation occurring within bearing steels subject to RCF. The continuum damage mechanics approach was implemented to capture microstructural decay. State and dissipation functions corresponding to the damage mechanics process were used via an energy criterion to predict the phase transformations of retained austenite (RA). Experimental measurements for RA decomposition and corresponding RS were combined to produce a function providing RS formation as a function of RA decomposition and stress history within the material. Microstructural decay, phase transformations, and internal stresses were implemented within a two-dimensional (2D) finite element analysis (FEA) line contact model to investigate variation in microstructural alterations due to RSs present within the material. In order to verify the model developed for this investigation, initial simulations were performed implementing conditions of previously published experimental work and directly comparing to observed RA decomposition and RS formation in 52100 steel deep groove ball bearings. The finite element model developed was then used to implement various RS profiles commonly observed due to manufacturing processes such as laser-shot peening and carburizing. It was found that some RS profiles are beneficial in altering RA decomposition patterns and increasing life while others proved less advantageous.

  PublisherDOI

• A Novel Modeling Approach to Simulate Rolling Contact Fatigue and Three-Dimensional Spalls

  Journal of Tribology · 2017-10-03 · 14 citations

  articleCorresponding

  In this study, a new approach has been developed to simulate three-dimensional (3D) experimental rolling contact fatigue (RCF) spalls using a two-dimensional (2D) finite element (FE) model. The model introduces a novel concept of dividing the 3D Hertzian pressure profile into 2D sections and utilizing them in a 2D continuum damage mechanics (CDM) RCF model. The distance between the two sections was determined by the size of the grains in the material microstructure. The 2D RCF model simulates characteristics of case carburized steels by incorporating hardness gradient and residual stress (RS) distribution with depth. The model also accounts for the topological randomness in the material microstructure using Voronoi tessellation. In order to define the failure criterion for the current model, sub-surface stress analysis was conducted for the Hertzian elliptical contact. It was predicted that the high shear stress region near the end of the major axis of the contact is the cause of catastrophic damage and spall formation. This prediction was validated by analyzing the spalls observed during RCF experiments using a surface profilometer. The model was implemented to predict RCF lives for 33 random material domains for different contact geometry and maximum Hertzian pressures. The model results were then compared to the RCF experiments conducted on two different test rigs, a three-ball-on-rod and a thrust bearing test apparatus (TBTA). It was found that the RCF lives obtained from the model are in good agreement with the experimental results. The results also demonstrated that the spalls generated using the analytical results resemble the spalls observed in experiments.

  PublisherDOI

• A novel approach for modeling retained austenite transformations during rolling contact fatigue

  Fatigue & Fracture of Engineering Materials & Structures · 2017-10-04 · 8 citations

  article1st author

  Abstract Retained austenite (RA) transformation in martensitic steels subjected to rolling contact fatigue (RCF) is a well‐established phenomenon. In this investigation, a novel approach is developed to predict martensitic transformations of RA in steels subjected to RCF. In order to achieve the objectives, a 2‐dimensional finite element model was developed to determine subsurface stresses due to rolling contact. These stresses are utilized within a continuum damage mechanics framework to determine RA transformations as a function of depth and cycles. Phase transformations were determined by comparing the required thermodynamic driving force for transformations to the energy dissipation of the microstructure. The results obtained from the combined FEA and continuum damage mechanics model were corroborated to the experimental results for RA decomposition as a function of depth and cycle for SAE 52100 steel. The results obtained are in good agreement with observed RA decomposition and DER formation as compared with the experimental results.

  PublisherDOI

Frequent coauthors

• Farshid Sadeghi

  Purdue University West Lafayette

  9 shared

• Yong‐Ching Chen

  Cummins (United States)

  3 shared

• Chinpei Wang

  Cummins (United States)

  3 shared

• Aditya A. Walvekar

  Purdue University West Lafayette

  1 shared

• Ben L. Wang

  1 shared

• Rohit Voothaluru

  Timken (United States)

  1 shared

• MA Quan-cang

  Cummins (United States)

  1 shared

• Zamzam Golmohammadi

  1 shared