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Weidlinger Associates, Inc.

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Weidlinger Presents Three Papers at 85th Shock and Vibration Symposium

Weidlinger engineers presented recent work on blast analysis, uncertainty quantification, and ductile-fracture prediction.

New York, NY, November 05, 2014 --( Weidlinger Associates, Inc., presented technical papers at three sessions of the 85th Shock and Vibration Symposium, which took place October 26-29, 2014, at the Hyatt Regency Hotel in Reston, Virginia. The symposium, hosted by HI‐TEST Laboratories and the Shock and Vibration Exchange (SAVE), is the “leading forum for the structural dynamics and vibration community to present and discuss new developments and ongoing research.”

“For more than 65 years, Weidlinger has been at the cutting edge of the most exciting developments in blast analysis and material failure prediction,” said company President and CEO Dr. Raymond Daddazio. “The symposium gives Weidlinger engineers the opportunity to share our research on topics of both national and international importance regarding the safety and survivability of all types of structures.”

On October 27, a presentation by Dr. Chok Kau Binky Lee and Dr. David Rubin explored efforts to extend ABNC (Air Blast Near Contact), a fast-running tool used for predicting blast loads from near-contact explosions, to include much larger yields and wall standoffs. The new tool, ABNC2, raises the upper yield limit of ABNC from 50 to 400 pounds, the associated increase in the upper limits of the standoff from 12 to 24 inches, and the height of burst from five to 10 feet. Using a typical laptop computer, ABNC2 is capable of producing a set of blast loads in less than one minute.

On October 28, Drs. Pawel Woelke and Badri Hiriyur (Weidlinger Associates), Dr. John W. Hutchinson (Harvard University), and Dr. Ken Nahshon (NAVSEA Naval Surface Warfare Center Carderock Division) presented a consistent methodology for predicting fracture and failure in marine-grade aluminum welds, based on large shell elements and the cohesive zone approach. The cohesive zone calibration methodology was discussed in detail and validated against experimental test results obtained by the U.S. Navy and a number of academic institutions.

Also on October 28, Mr. Adam Hapij, Mr. Ryan Anderson, Ms. Margaret Tang, and Dr. Raymond Daddazio discussed Weidlinger’s use of the Navy Enhanced Sierra Mechanics (NESM) software suite to facilitate uncertainty quantification (UQ) studies for full-scale finite-element simulations involving coupled fluid-structure interaction. These studies quantify the uncertainty inherent in modeling and simulation, as well as test data, to determine the ability of a naval vessel to survive underwater explosions. An overview of the approach used to process and interpret large datasets was provided. The role of UQ was highlighted in the test planning of full-ship shock trials and in the understanding of system performance.

Papers Presented

Session: “Blast: Numerical Methods”
“ABNC2 – A Fast‐running Code for Predicting Blast Loads from Near‐Contact Explosions,” by Dr. Chok Kau Binky Lee and Dr. David Rubin

Session: “Numerical Methods for Navy Structures”
“Cohesive Zone for Prediction of Ductile Fracture of Aluminum Welds,” by Drs. Pawel Woelke and Badri Hiriyur (Weidlinger Associates), Dr. John W. Hutchinson (Harvard University), and Dr. Ken Nahshon (NAVSEA Carderock Division)

Session: “Navy Enhanced Sierra Mechanics”
“Uncertainty Quantification Studies in NESM and Full‐Scale Test Planning and Evaluation,” by Mr. Adam Hapij, Mr. Ryan Anderson, Ms. Margaret Tang, and Dr. Raymond Daddazio

The Shock and Vibration Exchange ( was founded to serve as a clearinghouse for persons interested in shock and vibration and related specialties. The primary goals of SAVE are to maintain the continuity and offerings of the annual Shock and Vibration Symposium and to continue offering five-day shock courses.

Weidlinger Associates, Inc., is a structural engineering firm that designs and rehabilitates buildings, bridges, and infrastructure and provides special services in applied science, forensics, and physical security. The firm, which employees about 300 full-time staff, celebrated its 65th year in 2014. It is recognized worldwide for its innovative and practical design solutions and for its long-term commitment to advancing the state of the art in engineering. Headquartered in New York City, the firm has branch offices in the United States and the United Kingdom. For more information, please see
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