SelectedWorks - Robert Grandin

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Selected Works of Robert Grandin

Associate Scientist

Robert Grandin received a B.S. in aerospace engineering from Iowa State University in 2009. He received a Ph.D. in engineering mechanics from Iowa State University in 2014. His areas of expertise include automated defect detection, software development, algorithm development, big data analysis, GPU computing, and high resolution CT.

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About Robert Grandin

Robert Grandin received a B.S. in aerospace engineering from Iowa State University in 2009. He received a Ph.D. in engineering mechanics from Iowa State University in 2014. His areas of expertise include automated defect detection, software development, algorithm development, big data analysis, GPU computing, and high resolution CT.

Peer-Reviewed Articles (2)

An integrated framework for solid modeling and structural analysis of ...

Computer-Aided Design (2019)

Onur Rauf Bingol, Bryan Schiefelbein, Robert J. Grandin, Stephen D. Holland, et al.

Laminated fiber-reinforced polymer (FRP) composites are widely used in aerospace and automotive industries due to their combined properties of high ...

Surrogate Modeling of Ultrasonic Nondestructive Evaluation Simulations

Procedia Computer Science (2016)

Jacob Siegler, Leifur Leifsson, Robert Grandin, Slawomir Koziel, et al.

Ultrasonic testing (UT) is used to detect internal flaws in materials or to characterize material properties. Computational simulations are an ...

Evaluation of the fidelity of feature descriptor-based specimen tracking for ...

AIP Conference Proceedings (2018)

Rafael Radkowski, Stephen D. Holland and Robert J. Grandin

This research addresses inspection location tracking in the field of nondestructive evaluation (NDE) using a computer vision technique to determine ...

Model-assisted probability of detection of flaws in aluminum blocks using ...

AIP Conference Proceedings (2018)

Xiaosong Du, Leifur Leifsson, Robert J. Grandin, William Q. Meeker, et al.

Probability of detection (POD) is widely used for measuring reliability of nondestructive testing (NDT) systems. Typically, POD is determined experimentally, ...

Ultrasound scatter in heterogeneous 3D microstructures: Parameters affecting multiple scattering

AIP Conference Proceedings (2018)

Brady J. Engle, Ronald A. Roberts and Robert J. Grandin

This paper reports on a computational study of ultrasound propagation in heterogeneous metal microstructures. Random spatial fluctuations in elastic properties ...

Incorporation of composite defects from ultrasonic NDE into CAD and ...

AIP Conference Proceedings (2017)

Onur Rauf Bingol, Bryan Schiefelbein, Robert J. Grandin, Stephen D. Holland, et al.

Fiber-reinforced composites are widely used in aerospace industry due to their combined properties of high strength and low weight. However, ...

Surrogate modeling of ultrasonic simulations using data-driven methods

AIP Conference Proceedings (2017)

Xiaosong Du, Robert J. Grandin and Leifur Leifsson

Ultrasonic testing (UT) is used to detect internal flaws in materials and to characterize material properties. In many applications, computational ...

UTSim2 validation

AIP Conference Proceedings (2017)

Robert J. Grandin and Tim Gray

The Center for NDE (CNDE) at Iowa State University has a long history of developing physics models for NDE and ...

Automated Construction of Layer-by Layer Finite Element Sub-Models of Damaged ...

Proceedings of the American Society for Composites: Thirty-second Technical Conference (2017)

Stephen D. Holland, Adarsh Krishnamurthy, Onur Bingol and Robert Grandin

Composite laminate structures are usually modeled as a shell in finite element analysis tools for strength and stiffness determination. However, ...

Simulating UT measurements from bolthole cracks

AIP Conference Proceedings (2016)

Robert J. Grandin, Timothy A. Gray and Ronald A. Roberts

Analytical computer models of UT measurements are becoming more prominent in evaluating NDEmethods – a process known as Model Assisted ...

Meso-scale imaging of composite materials

AIP Conference Proceedings (2015)

Robert J. Grandin and Joseph N. Gray

The performance of composite materials is controlled by the interaction between the individual components as well as the mechanical characteristics ...

Implementation of automated 3D defect detection for low signal-to noise ...

AIP Conference Proceedings (2014)

Robert J. Grandin and Joseph N. Gray

The need for robust defect detection in NDE applications requires the identification of subtle, low-contrast changes in measurement signals usually ...

Model-assisted development of a laminography inspection system

Center for Nondestructive Evaluation Conference Papers, Posters and Presentations (2011)

Robert J. Grandin and Joseph N. Gray

Traditional computed tomography (CT) is an effective method of determining the internal structure of an object through non-destructive means; however, ...

Beam Flattener Design for High-Energy Radiographic Inspection

Aerospace Engineering Conference Papers, Presentations and Posters (2009)

Robert J. Grandin and Thomas J. Rudolphi

This report documents the work done to develop a beam flattener for use in the inspection of rocket motors at ...

Early-state damage detection, characterization, and evolution using high-resolution computed tomography

Graduate Theses and Dissertations (2014)

Safely using materials in high performance applications requires adequately understanding the mechanisms which control the nucleation and evolution of damage. ...

Abstracts (6)

Incorporation of Composite Defects from Ultrasonic NDE into CAD and ...

Review of Progress in Quantitative Nondestructive Evaluation (2016)

Onur Rauf Bingol, Bryan Schiefelbein, Robert J. Grandin, Stephen D. Holland, et al.

Fiber-reinforced composites are widely used in aerospace industry due to their combined properties of high strength and low weight. However, ...

Modeling for UT Inspection of Anisotropic Materials

Review of Progress in Quantitative Nondestructive Evaluation (2016)

Robert A. Roberts, Robert Grandin and Andrew Downs

This presentation reports on the extension of an established CNDE ultrasound beam transmission model to accommodate transmission in generally anisotropic ...

Models for UT Inspection of Bolthole Cracks in Layered Structures

Review of Progress in Quantitative Nondestructive Evaluation (2016)

Robert Grandin, Tim Gray and Ron Roberts

Due to the geometrical complexities of bolted, layered airframe structures, the application of Model Assisted Probability of Detection, or MAPOD, ...

Surrogate Modeling of Ultrasonic Testing Simulations Using Variable-Fidelity Models and ...

Review of Progress in Quantitative Nondestructive Evaluation (2016)

Robert Grandin and Leifur Leifsson

Ultrasonic testing (UT) is used to detect internal flaws in materials or to characterize material properties [1]. Computational simulations are ...

Ultrasound Scatter in Heterogeneous 3D Microstructures

Review of Progress in Quantitative Nondestructive Evaluation (2016)

Brady Engle, Ronald A. Roberts and Robert Grandin

This paper reports on a computational study of ultrasound propagation in heterogeneous metal microstructures. Random spatial fluctuations in elastic properties ...

Validation of UTSim2, a New Ultrasonic Simulation Package

Review of Progress in Quantitative Nondestructive Evaluation (2016)

Robert Grandin and Timothy Gray

The Center for NDE (CNDE) at Iowa State University has a long history of developing physics models for NDE and ...