• High rate testing of composite fastener joints with and without clamp-up 

  Gomez, Adrian; Keshavanarayana, Suresh R.; Castillo, Luis D.; Kona, Aswini; Bhasin, Akhil; Pang, Jenna K.; Molitor, Matthew; Rassaian, Mostafa (DEStech Publications Inc., 2018)

  The NASA Advanced Composites Consortium (ACC) High Energy Dynamic Impact (HEDI) group has been investigating experimentally the effects of testing speed and fastener clamp-up on the behavior of single lap shear composite ...

• An engineering approach to analyze damage initiation modes in tapered composite structures 

  Rao, Prabhakar M.; Palliyaguru, Upul R.; Gurvish, Mark R.; Seneviratne, Waruna P. (DEStech Publications Inc., 2018)

  In this work an engineering approach is demonstrated for analyzing damage initiation modes in tapered composite structures. The analysis methodology includes simulation of the non-linear static response of tapered composite ...

• Material state monitoring using embedded sensors for validating models for detecting process-induced damages in polymer composites 

  Seneviratne, Waruna P.; Tomblin, John S.; Liyanage, Shakya S.; Shah, Hemal B. (DEStech Publications Inc., 2018)

  Composite material cure recipes are based on manufacturer-recommended cure cycle inputs, which are developed as a result of various stochastic cure kinetics models during the development of resin formulation. The time, ...

• Defects characterization, damage mapping, and property evaluation of composites 

  Lua, Jim Y.; Sadeghirad, Alireza; Cui, Xiaodong; Karuppiah, Anand Vijay; Saathoff, Caleb; Seneviratne, Waruna P. (DEStech Publications Inc., 2018)

  The presence of voids in the composite laminates can reduce the mechanical properties in composites and these voids can become precursors in the activation of other failure modes such as delamination. Knowing the volume ...

• Progressive damage and failure prediction of interlaminar tensile specimen with initial fabrication induced defects 

  Cui, Xiaodong; Karuppiah, Anand Vijay; Pham, Dinh Chi; Lua, Jim Y.; Saathoff, Caleb; Seneviratne, Waruna P. (DEStech Publications Inc., 2018)

  An automatic solution process to evaluate the effects of fabrication induced defects in composite components is developed. The framework of this approach includes defects extraction from the X-ray computed tomography (CT) ...

• Automating structural modeling of composites enriched by X-ray micro-tomography and digital imaging data 

  Iliopoulos, Athanasios P.; Michopoulos, John G.; Steuben, John C.; Birnbaum, Andrew J.; Lua, Jim Y.; Karuppiah, Anand Vijay; Seneviratne, Waruna P.; Saathoff, Caleb (ASME, 2018)

  The manufacturing processes of Fiber Reinforced Polymers (FRPs) as composite materials are frequently prone to the creation of various types of undesired morphologies and defects. These can include layer waviness, inclusions, ...

• Chapter 39 -- Updating composite materials handbook-17 volume 5— ceramic matrix composites 

  Douglas Kiser, J.; David, Kaia E.; Davies, Curtis; Missri-Andrulonis, Rachael; Ashforth, Cindy (Wiley, 2018)

  This chapter discusses the updated version of CMH‐17 Volume 5—Ceramic Matrix Composites handbook released in 2002, which provides a more comprehensive overview of current Ceramic Matrix Composites (CMC) technology. Emphasis ...

• Refill Friction Stir Spot Joining for aerospace aluminum alloys 

  Boldsaikhan, Enkhsaikhan; Fukada, Shintaro; Fujimoto, Mitsuo; Kamimuki, Kenichi; Okada, Hideki; Duncan, Brent; Bui, Phuonghanh; Yeshiambel, Michael; Brown, Brian M.; Handyside, Alan Bruce (Springer, 2017)

  Refill Friction Stir Spot Joining (RFSJ) developed by Kawasaki Heavy Industries (KHI) is a derivative technology of friction stir spot welding for joining aerospace aluminum alloys. The aerospace aluminum alloys were ...

• End effector for forming swept friction stir spot welds 

  Burford, Dwight A. (United States Patent and Trademark Office, 2015-09-15)

  An apparatus includes a connector and is configured to mount to a machine having multiple axes of control. A control signal on the connector determines a path of a rotating tool holder.

• Macrocyclic and peptidomimetic compounds as broad-spectrum antivirals against 3C or 3C-like proteases of picornaviruses, caliciviruses and coronaviruses 

  Chang, Kyeong-Ok; Kim, Yunjeong; Groutas, William C. (United States Patent and Trademark Office, 2016-04-12)

  Antiviral protease inhibitors, including macrocylic transition state inhibitors and peptidomimetics are disclosed, along with related antiviral compounds, and methods of using the same to treat or prevent viral infection ...

• Sulfamide and bis-sulfamide amino acid derivatives as inhibitors of proteolytic enzymes 

  Groutas, William C. (United States Patent and Trademark Office, 2002-12-17)

  Compounds of the general formula I are provided: ##STR1## and pharmaceutically acceptable salts thereof, wherein, Z is a chemical species or R.sub.i capable of binding at a primary specificity site of a protease; Y is a ...

• System and method for capturing image sequences at ultra-high framing rates 

  Madhavan, Viswanathan; Hijazi, Ala (United States Patent and Trademark Office, 2010-08-17)

  An imaging system for capturing a sequence of images from a target at ultra-high framing rates is disclosed. The imaging system includes an illumination system operable to emit at least first and second light pulses at ...

• Friction stir welding tool having a counterflow pin configuration 

  Burford, Dwight A. (United States Patent and Trademark Office, 2011-05-17)

  A friction stir welding tool having one or more tapered flats for promoting flow of weld material toward the pin terminus and one or more counter-spiraling channels or threads which for promoting flow of the weld material ...

• Serine protease inhibitors 

  Groutas, William C. (United States Patent and Trademark Office, 1996-08-27)

  Isothiazolidin-3-one-1,1 dioxide, 3-oxo-1,2,5-thiadiazolidine-1,1,-dioxide and derivatives thereof, reduce or inhibit the activity of serine proteases. Such compounds are useful as anti-inflammatory and anti-metastatic agents.

• 1,2,5, thiadiazolidin-3-one 1,1-dioxide derivatives 

  Groutas, William C.; Kuang, Rongze (United States Patent and Trademark Office, 2002-07-16)

  Substituted derivatives of 1,2,5-thiadiazolidin-3-one 1,1-dioxides, oligomers containing them, and methods of using them.

• Friction stir welding tool having a scroll-free concentric region 

  Burford, Dwight A. (United States Patent and Trademark Office, 2011-09-13)

  A friction stir welding tool having a shoulder section with a scroll pattern that terminates prior to the edge or boundary of the shoulder section to create a scroll-free concentric surface area.

• End effector for forming swept friction stir spot welds 

  Burford, Dwight A. (United States Patent and Trademark Office, 2013-05-21)

  An apparatus includes a connector and is configured to mount to a machine having multiple axes of control. A control signal on the connector determines a path of a rotating tool holder.

• Latent isocynate derivatives useful for deactivating enzymes 

  Groutas, William C. (United States Patent and Trademark Office, 1990-05-29)

  Certain amino-acid derivatives are disclosed as effective inhibitors of human leukocyte elastase and therefore useful in preventing the imbalance of this proteolytic enzyme in vivo. The compounds specifically are derivatives ...

• Protective antigen having fluorinated histidine residues 

  Bann, James G. (United States Patent and Trademark Office, 2010-06-08)

  The unnatural amino acid analogue 2-fluorohistidine (2-FHis) was incorporated into protective antigen to produce a protein which resists protonation at physiological pH by reducing the side-chain pKa. The protein structure ...

• Viral and fungal inhibitors 

  Padmanabhan, Radhakrishnan; Groutas, William C.; Korba, Brent E (United States Patent and Trademark Office, 2013-08-20)

  Novel classes of viral and fungal inhibitors are disclosed. These compounds are useful in treating, preventing, and/or ameliorating viral infections such as, for example, Hepatitis C Virus, West Nile Virus, Dengue Virus, ...

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