Effect of Low Velocity Impact on the Vibrational Behavior of a Composite Wing

Luna, De; Richard, Michael

doi:10.15368/theses.2016.16

Cited by 1 publication

(5 citation statements)

References 8 publications

(10 reference statements)

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“…The magnitude of the speed, and therefore nature, of the impact would have been different. However, recent work at Cal Poly included the use of a Dynatup 8250 drop tower which could be used to test AO exposed specimens according to ASTM D7136 [11]. Questions as to the comparability of this test to on-orbit impact were raised as other use cases were explored.…”

Section: Cases and Materials Consideredmentioning

confidence: 99%

“…One downside of using composite face sheets is how easily defects can be introduced into a part during the manufacturing process. An excellent overview of composites and manufacturing methods is provided in reference [11]. Aluminium honeycomb is often used due to its high strength to weight ratio.…”

Section: Cases and Materials Consideredmentioning

confidence: 99%

“…Composites that use resins often require heat and/or pressure to cure them. The heat is either supplied externally, or can be generated internally using a two part catalytic reaction [11]. Pressure needs to be applied to the part for two purposes.…”

Section: Composite Curing Equipmentmentioning

confidence: 99%

“…Pressure needs to be applied to the part for two purposes. The first is to squeeze out excess resin, and the second is to ensure no air bubbles remain between layers in a laminate [11].…”

Section: Composite Curing Equipmentmentioning

confidence: 99%

“…Heat press used to cure composite materials in the Cal Poly aerospace composites lab [11]. The second batch's panel curing the adhesive.…”

mentioning

confidence: 99%

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Modification of a Ground Based Atomic Oxygen Simulation Apparatus to Accommodate Three Dimensional Specimens

Ward¹

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Modification of a Ground Based Atomic Oxygen Simulation Apparatus toAccommodate Three Dimensional Specimens Charles WardThe space environment presents various challenges when designing systems and selecting materials for applications beyond Earth's atmosphere. For mission success, these challenges must be considered. One of the detrimental aspects of the space environment is Atomic Oxygen, AO. Only present in harmful quantities in Lower Earth Orbit, LEO, AO causes significant damage to materials by breaking molecular bonds. California Polytechnic State University's, Cal Poly's, space environments laboratory features an apparatus capable of simulating this environment. Very thin or short samples were tested to observe the mass loss due to erosion of the sample material. Recent modifications to the system allow it to expose surfaces of three dimensional objects to AO rather than only those two dimensional objects. Simulating this effect on taller samples makes available the opportunity to test coupons that are then used in additional testing to measure the effect of that erosion on other properties. Challenges in adapting the AO system are explored and addressed, as well as some possible use cases for future work. As a use case, bending moment specimens were exposed to AO prior to testing in four point bending. Multiple regression models were constructed to determine variables contributing to slope changes between specimen pairs' linear-elastic regions of force-displacement graphs. Results show that AO exposed specimens had significantly gentler slopes in the linear elastic region of the force-displacement curve, meaning that AO exposure reduced structural rigidity of the coupons.iv ACKNOWLEDGMENTS Thanks to:• My committee members, for all the support and valuable insights I neededespecially as problems arose.• Dr. Abercromby and Max Glicklin. Dr. Abercromby was one of the original creators of the ever evolving space environments lab and lecture courses at Cal Poly. Max built the chamber I got to modify and remains a strong supporter of the program as an alum. Both have contributed immeasurably not only to this work, but towards pushing me to find my own answers and learn in the process.• Cody Thompson, for taking time from his many responsibilities to machine parts for my project, and for being helpful whenever I wandered around the aero labs needing help.• Dr. Kabir, who in his brief time at Cal Poly has made immense contributions to the Composites/Structures lab. I will always remember the enthusiasm he has for working with students.• Steve Smith at Tencate Composites, for donating valuable space-grade carbon fiber prepreg and film adhesives that were crucial for this work.• The Aerospace Engineering department, for providing funding for this project.• My family, for always believing in me and supporting me -even when I didn't deserve it.• My father, whose sacrifices for his country paid for my education.• Merilee, for supporting me since my community college years, for blessing our home with two children, and f...

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Section: Cases and Materials Consideredmentioning

confidence: 99%

Section: Cases and Materials Consideredmentioning

confidence: 99%

Section: Composite Curing Equipmentmentioning

confidence: 99%

“…Pressure needs to be applied to the part for two purposes. The first is to squeeze out excess resin, and the second is to ensure no air bubbles remain between layers in a laminate [11].…”

Section: Composite Curing Equipmentmentioning

confidence: 99%

“…Heat press used to cure composite materials in the Cal Poly aerospace composites lab [11]. The second batch's panel curing the adhesive.…”

mentioning

confidence: 99%

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