Meet us in Orlando! 3 sessions will be presented by our team and visit us in exhibit booth 308SWG-ReD will be presenting at the 91st Shock & Vibration Symposium (SAVE) Sept 19-23. WWW.SAVECENTER.ORG

PERFORMANCE OF ADAPTABLE LIGHTWEIGHT IMPACT-PROOF PLATES
Dr. Jun Han, Shock Tech (SWG-Red)
Dr. James Rall, Shock Tech (SWG-Red)
Dr. Daryoush Allaei, Shock Tech (SWG-Red)
The prediction of non‐linear dynamic response of a mortar weapon baseplate to impact loading is challenging due to the complexity of the baseplate structures and loading conditions. To simulate the dynamic response of the baseplate, the authors developed a finite element modelling methodology based on ANSYS‐FEA  package. The  FE  model was used to evaluate a new design of a  baseplate,  Adaptable  Lightweight Impact Proof Plate (ALIPP) developed at Shock Tech. ALIPP is optimized for handling high-impact loading to improve impact resistance and reduce deformation while reducing weight and cost. The numerical FE modeling of the impact resistance baseplates was conducted using the transient analysis approach. Dynamic responses, including deformation and stress, with an impact load of 500 kips were simulated. The developed FE models are capable for simulating non‐linear dynamic properties of mortar weapon baseplates. The conventional baseplate and ALIPP were compared. The maximum deformation of ALIPP was found to be 30% lower than the conventional base plate, and the maximum stress of ALIPP was found to be 51% less than the conventional baseplate. The lighter weight (9%) of ALIPP together with the improved performance, provide significant advantages for this new impact resistance baseplate. 

REUSABLE, HIGH-PERFORMANCE HONEYCOMB FOR AIRDROP APPLICATIONS
Dr. Daryoush Allaei, Shock Tech (SWG-Red)
Dr. James Rall, Shock Tech (SWG-Red)
Dr. Jun Han, Shock Tech (SWG-Red)
The use of crushable materials to dissipate ground impact energy, or any large shock energy, is essential in protecting military gears, medical equipment, and other hardware when dropped from an aircraft. The application of such materials allows military entities to safely transport, evac and air‐drop critical supplies, ammunition, and vehicle into previously hard-to-reach areas. Additionally, for civilian applications, such as air shipping, and ground transport, damage‐free cargo relies heavily on these crushable materials, often in some sort of honeycomb structure. This work is focused on the development of Shock‐Honeycomb (SHoc), a reusable, high-performance,  elastomeric product suitable for replacing fielded disposable paper honeycomb. SHoc is based on a modular geometry, number of connectable elastomeric parts, and elastomer durometer. Each part fits together into a larger pod of six and is designed to be assembled by a packing crew without the use of cutters or glue. The geometry of SHoc allows for flexibility in isolation footprint. Pods can be assembled and grouped according to the shape of the cargo or payload to be isolated. Once assembled, the overall footprint of SHoc can be equivalent to that of paper honeycomb while offering far more flexibility for a variety of shapes without using cutters. Once disassembled, however, SHoc offers 97% space savings over paper honeycomb. Most importantly, due to its elastomeric properties, Shock‐Honeycomb is reusable. After every airdrop,  or once an applied shock load is released,  SHoc will rebound back to its original dimensions and geometry, ready to absorb more energy again. The biggest saving is when used in training exercises. The training payload or bundle will not need to be rebuilt after each training drop. SHoc can be dropped more than 25 times without showing any performance degradation; resulting in huge savings in labor hours. Extensive tests have been performed on SHoc including static, dynamics, usability, size, reusability, and environmental. A single 12” x 12” x 3” pod of Shock‐Honeycomb has to date experienced 25 direct impact tests and still shows no signs of dynamic performance degradation. As a reference, a paper honeycomb pod of equal dimensions can only last one impact. Additionally, marine testing of the two products shows SHoc’s significant advantage over traditional paper honeycomb. After being submerged for 1 minute in room temperature water,  paper honeycomb catastrophically failed our high‐energy impact testing whereas Shock‐Honeycomb was held underwater for 10 minutes and showed no signs of performance degradation.

DYNAMIC SIMULATIONS FOR AIRDROP PLATFORM
Dr. Jun Han, Shock Tech
Dr. James Rall, Shock Tech
Mr. Benjamin Reydel, Shock Tech
Dr. Daryoush Allaei, Shock Tech Airdrop platforms have been widely used in military for delivering rescue materials, medicines, food, and water, etc. to specific areas.  Although parachutes may largely reduce the dropping speed, landing of airdrop platforms may be subjected to failure due to dynamically complex impact to the ground. Currently, the design for airdrop platforms is mainly evaluated through experiments at qualification test facilities and/or actual airdrop tests. The approach is time‐consuming and costly.  Computer simulation,  as an effective numerical analysis method, may simulate airdrop environment and obtain dynamic information at any drop location, which is difficult to achieve through experiments. Simulation can reduce the testing cost and save time. To simulate the dynamic response of airdrop platforms, the authors developed a finite element model utilizing ANSYS‐FEA package. The FE model was constructed using Explicit Dynamic solver to evaluate an airdrop platform design,  Lightweight  Adaptable  Airdrop  Platform  (LAAP),  developed at  Shock Tech. LAAP was optimized for handling lightweight airdrop platform to support G12 parachute employment in special operations and rescue vehicles.  To achieve a  set of optimized structural parameters, the modeling analysis, and experimental investigations were carried out for evaluating the dynamic response of the platform, and its impact resistance performance. The developed FE models are capable of simulating non‐linear dynamic properties of airdrop platforms and can aid in designing efficient airdrop platforms in a timely manner and at minimum cost. 

Please visit us at our exhibit booth 308