[Che-student-staff-list] Thesis Defense Announcement for Jason Wickham - Today

[Johnson, Beverly J]

This email is to announce that Jason Wickham, will be defending his thesis:  The Role of Adhesion in the Formation of Hot Spots in Energetic Materials Thursday, February 11, 2021 at 4:00 PM.  The dissertation is directed by Dr. Steve Beaudoin and Dr. Steve Son.  The abstract and WebEx info are below, and all are welcome to attend.



The transformation of mechanical energy into thermal energy within composite energetic materials through various thermomechanical mechanisms is thought to lead to the creation of localized areas of intense heating. The growth of these “hot spots” is responsible for the bulk reaction or decomposition of the energetic material. Understanding the formation and growth of these hot spots has been an active area of research particularly for high-speed impact and shock conditions, but further work remains to be done in particular with respect to hot spot formation due to periodic mechanical excitation. Previous literature has established that many potential thermomechanical mechanisms may act at the interface between the constituent components of a composite energetic material. In order to provide further insight and guidance into the design of safer and more resilient energetic materials, the role of adhesion on hot spot formation for polymer bonded explosives (PBXs), a subset of composite energetic materials, was explored. Single HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazocane) crystals in polymer blocks were subjected to ultrasonic excitation and subsequent heating was captured via infrared thermography. Subsequent testing of HMX PBXs using a drop weight tower captured changes in the sensitivity of the energetic material. Variation of the polymer binder allowed for a range of adhesive and mechanical properties to be examined. These experiments on the role of adhesion under these kinds of excitations provided insight into how mechanical energy is being transformed into localized heating.

From: Bev Johnson <messenger at webex.com>
Sent: Wednesday, February 10, 2021 11:58 AM
To: Johnson, Beverly J <bevjohnson at purdue.edu>
Subject: (Forward to others) Webex meeting invitation: Wickham Defense


You can forward this invitation to others.

Bev Johnson is inviting you to a scheduled Webex meeting.



Thursday, February 11, 2021
4:00 PM  |  (UTC-05:00) Eastern Time (US & Canada)  |  2 hrs 30 mins



Join meeting<https://purdue.webex.com/purdue/j.php?MTID=m9ceb39f5d6f51e54d7fa6378e330565a>


More ways to join:

Join from the meeting link
https://purdue.webex.com/purdue/j.php?MTID=m9ceb39f5d6f51e54d7fa6378e330565a



Join by meeting number
Meeting number (access code): 120 734 1702
Meeting password: boilerup



Tap to join from a mobile device (attendees only)
+1-855-282-6330,,1207341702##<tel:%2B1-855-282-6330,,*01*1207341702%23%23*01*> US TOLL FREE
+1-415-655-0003,,1207341702##<tel:%2B1-415-655-0003,,*01*1207341702%23%23*01*> US TOLL


Join by phone
+1-855-282-6330 US TOLL FREE
+1-415-655-0003 US TOLL
Toll-free calling restrictions<https://www.webex.com/pdf/tollfree_restrictions.pdf>



Join from a video system or application
Dial 1207341702 at purdue.webex.com<%20sip:1207341702 at purdue.webex.com>
You can also dial 173.243.2.68 and enter your meeting number.



Join using Microsoft Lync or Microsoft Skype for Business
Dial 1207341702.purdue at lync.webex.com<%20sip:1207341702.purdue at lync.webex.com>



Need help? Go to https://help.webex.com


-------------- next part --------------
An HTML attachment was scrubbed...
URL: </ECN/mailman/archives/che-student-staff-list/attachments/20210211/8528c2a8/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Webex_Meeting.ics
Type: application/octet-stream
Size: 8713 bytes
Desc: Webex_Meeting.ics
URL: </ECN/mailman/archives/che-student-staff-list/attachments/20210211/8528c2a8/attachment-0001.obj>