A Fracture Mechanics Based Methodology to Address Face Sheet/Core Disbonding in Composite Sandwich Structures Krueger, R., Adams, D., Berggreen, C., Hoyt, D. M., Saseendran, V. 2024 American Society for Composites (ASC) 39th Annual Technical Conference, San Diego, CA, November 2024.
Damage Tolerance
Sandwich Disbond Certification Overview: Energy-Based Analysis Approach and Applications Lobo, M., and Hoyt, D.M. Joint CMH-17-EASA-FAA Workshop on Sandwich Disbonding, Technical University of Denmark (DTU), Copenhagen, Denmark, June 20 -23, 2023. PDF of Presentation
Sandwich Disbond Certification Overview: Design Criteria and Substantiation for Face Sheet Disbonds Hoyt, D.M., Fawcett, A., Waite, S., Ilcewicz, L. Joint CMH-17-EASA-FAA Workshop on Sandwich Disbonding, Technical University of Denmark (DTU), Copenhagen, Denmark, June 20 -23, 2023. PDF of Presentation
Transport Aircraft Composite Aging Fawcett, A., Fualdes, C., Enjuto, P., Hoyt, D.M., and Ilcewicz, L. 2020 AIAA SCITECH Forum, 9 January 2020, Orlando, FL.
Investigation of Stiffening Effects on Notch Growth Trajectory of Composite Stiffened Panels with Large Transverse Notches Enjuto, P., Lobo, M., Walker, T.H., Peña, G., Cregger, S.E., and Wanthal, S.P. 2019 AIAA SciTech Forum, AIAA 2019-0515, 7-11 January 2019, San Diego, California.
Application of Aerospace Durability and Damage Tolerance Approaches to Wind Blade Design Graesser, D.L., and Hoyt, D.M. 2018 Sandia Blade Workshop, August 28-29, 2018, Lubbock, Texas. PDF of Presentation
Investigation of Stiffening and Curvature Effects on the Residual Strength of Composite Stiffened Panels with Large Transverse Notches Enjuto, P., Walker, T.H., Lobo, M., Cregger, S.E., and Wanthal, S.P. 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, AIAA SciTech Forum, (AIAA 2018-2251), 8 – 12 January 2018, Kissimmee, Florida.
A Conceptual Framework for Practical Progressive Damage Analysis of Stiffened Composite Aircraft Structure with Large Notches Subjected to Combined Loading Walker, T.H. Presented at the 63rd Composite Materials Handbook-17 (CMH-17) Meeting, 17 March 2015, Salt Lake City, Utah.
Energy-Based Stiffness Degradation for Alleviation of Mesh Sensitivity for Progressive Failure Analysis of Center-Notched Composite Panels Minguet, P.J., Karayev, K.Z., Balabanov, V., Lee, S., Muraliraj, N., Walker, T.H., Nelson, E.E., Robbins, D. AIAA 2012-1620, 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, 23 – 26 Apr 2012.
Residual Strength Evaluation of Typical Aircraft Composite Structures with a Large Notch Karayev, K.Z., Minguet, P.J., Lee, S., Balabanov, V., Muraliraj, N., Walker, T.H., Nelson, E.E. Robbins, D., AIAA 2012-1862, 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, 23 – 26 Apr 2012.
Damage Tolerance of Composites Sandwich Airframe Structures—Additional Results Tomblin, J.S., Raju, K.S., Walker, T.H., Acosta, J.F. DOT/FAA/AR-05/33, 2005.
Damage Assessment for Composite Sandwich Structure Walker, T.H., Graesser, D.L., Ward, S.H., Floyd, J.F., Razi, H., Ploubis, V. AIAA 2003-1596, 44th AIAA/ASME/ASCE/AHS Structures, Structural Dynamics, and Materials Conference, Norfolk, Virginia, 7 – 10 Apr 2003.
Strength and Fatigue Life Modeling of Bonded Joints in Composite Structure Hoyt, D.M., Ward S.H., Minguet, P.J. ASTM Journal of Composites Technology & Research, Vol. 24, No. 3, pp. 188-208, July 2002.
Detailed Analysis of a Complex Bonded Joint Rousseau, C.Q., Ferrie, C., Hoyt, D.M., Ward, S.H. Presented at the American Helicopter Society (AHS) Hampton Roads Chapter Structures Specialists’ Meeting, Williamsburg, VA, November 2001.
Fuselage Residual Strength—Response and Prediction Walker, T. H. FAA Composite Structural Development Workshop, Renton, Washington, Nov. 29 – Dec.1, 2000.
Strength and Fatigue Life Modeling of Bonded Joints in Composite Structure Hoyt, D.M., Ward, S.H., Minguet, P.J. American Society for Composites (ASC) 15th Technical Conference, September 2000.
Characterization of Notched Composites Strength with Empirical and Analytical Methods Bau, H., Hoyt, D.M. NSE Composites Phase II Final Report to USAF for STTR AF96T009 (AF Contract # F33615-97-C-5013), July 2000.
Open Hole Compression Strength and Failure Characterization in Tape Laminates Bau, H., Hoyt, D.M., Rousseau, C.Q. Composite Structures: Theory and Practice, ASTM STP 1383, 2000.
Open Hole Compression Strength and Failure Characterization in Tape Laminates Bau, H., Hoyt, D.M. presentation to ASTM D-30, Technical Symposium, May, 1999.
Progressive Damage Analysis for Notched Compression Strength Bau, H., Hoyt, D.M. American Helicopter Society Conference for Affordable Composite Structures, October, 1998.
Advanced Technology Composite Fuselage—Repair and Damage Assessment Supporting Maintenance Flynn, B.W., Bodine, J.D., Dopker, B., Finn, S.R., Griess, K.H., Hanson, C.T., Harris, C.G. NASA CR-4733, 1997.
Accurate Characterization of Composite Strength through Empirical and Progressive Damage Methods Bau, H., Hoyt, D.M. NSE Composites Phase I Final Report to USAF for STTR AF96T009, April, 1997.
Damage Tolerance of Composite Fuselage Structure Walker, T., Scholtz, D., Flynn, B., Dopker, B., Bodine, J., Ilcewicz, L., Rouse, M., and McGowan, D. Sixth NASA/DOD/ARPA Advanced Composite Technology Conference, NASA CP-3326, 1996.
Tension Strength with Discrete Source Damage Poe, C.C. Jr., Harris, C.E., Coats, T.W., and Walker, T.H. Fifth NASA Advanced Technology Conference, NASA CP-3294, pp. 369-437, 1995.
Fracture Scaling Parameters of Inhomogeneous Microstructure in Composite Structures Cairns, D.S., Ilcewicz, L.B., Walker, T.H., and Minguet, P.J. Composites Science and Technology, vol. 53, issue 2, pp. 223-231, 1995.
Tension Fracture of Laminates for Transport Fuselage – Part IV: Damage Tolerance Analysis Ilcewicz, L.B., Walker, T.H., Murphy, D.P., Dopker, B., Scholz, D.B., Cairns, D.S., and Poe, C.C. Jr. Fourth NASA Advanced Composite Technology Conference, NASA CP-3229, pp. 265-298, 1994.
Benchmark Panels Walker, T.H., Ilcewicz, L.B., Bodine, J.B., Murphy, D.P., and Dost, E.F. NASA CR-194969, 1994.
Damage Tolerance Analysis of Composite Transport Fuselage Structure Dopker, B., Murphy, D., Ilcewicz, L., and Walker, T. 35th SDM Conference, AIAA Paper 94-1406, 1994.
Tension Fracture of Laminates for Transport Fuselage—Part III: Structural Configurations Walker, T.H., Ilcewicz, L.B., Polland, D.R., Bodine, J.B., and Poe, C.C. Jr. Fourth NASA Advanced Composite Technology Conference, NASA CP-3229, pp. 243-264, 1994.
02 Mar: Far-Field and Near-Field Strain Response of Fiber Placed Structures to Stress Concentrations
Far-Field and Near-Field Strain Response of Fiber Placed Structures to Stress Concentrations Cairns, D.S., Ilcewicz, L.B., and Walker, T.H. Composites Engineering, Vol. 3, No. 11, pp. 1087-1097, 1993.
Response of Automated Tow Placement Laminates to Stress Concentrations Cairns, D.S, Ilcewicz, L.B., and Walker, T.H. Third NASA Advanced Composite Technology Conference, NASA CP-3178, 1993.
Tension Fracture of Laminates for Transport Fuselage – Part II: Large Notches Walker, T.H., Ilcewicz, L.B., Polland, D.R., and Poe, C.C. Jr. Third NASA Advanced Composite Technology Conference, NASA CP-3178, pp. 727-758, 1993.
Nonlinear and Progressive Failure Aspects of Transport Composite Fuselage Damage Tolerance Walker, T., Ilcewicz, L., Murphy, D., and Dopker, B. Computational Methods for Failure Analysis and Life Prediction, NASA-CP-3230, pp. 11-35, 1993.
Tension Fracture of Laminates for Transport Fuselage—Part I: Material Screening Walker, T.H., Avery, W.B., Ilcewicz, L.B., Poe, C.C. Jr., and Harris, C.E. Second NASA Advanced Composite Technology Conference, NASA CP-3154, pp. 197-238, 1992.