Author: K. N. Lauraitis
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
Book Description
The type of damage investigated in this program included; (a) that which is produced by low speed impact of a blunt object, such as an accidentally dropped hand tool; (b) severe delamination produced by residual strength testing of an impact damaged specimen; and (c) delamination produced by placing release film between two plies during fabrication. Specimens containing (a) and (b) type of damage were used in the first phase to experimentally determine: Amount of damage produced by the freeze-thaw cycle in representative impact damaged specimens; Amount of water picked up in the liquid state by the ruptured and delaminated regions of typical impact-damaged specimens; and Whether water migrates into and out of damaged regions during freeze-thaw cycling.
Experimental Investigation of the Interaction of Moisture, Low Temperature, and Low Level Impact on Graphite/Epoxy Composites-II.
Author: K. N. Lauraitis
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
Book Description
The type of damage investigated in this program included; (a) that which is produced by low speed impact of a blunt object, such as an accidentally dropped hand tool; (b) severe delamination produced by residual strength testing of an impact damaged specimen; and (c) delamination produced by placing release film between two plies during fabrication. Specimens containing (a) and (b) type of damage were used in the first phase to experimentally determine: Amount of damage produced by the freeze-thaw cycle in representative impact damaged specimens; Amount of water picked up in the liquid state by the ruptured and delaminated regions of typical impact-damaged specimens; and Whether water migrates into and out of damaged regions during freeze-thaw cycling.
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
Book Description
The type of damage investigated in this program included; (a) that which is produced by low speed impact of a blunt object, such as an accidentally dropped hand tool; (b) severe delamination produced by residual strength testing of an impact damaged specimen; and (c) delamination produced by placing release film between two plies during fabrication. Specimens containing (a) and (b) type of damage were used in the first phase to experimentally determine: Amount of damage produced by the freeze-thaw cycle in representative impact damaged specimens; Amount of water picked up in the liquid state by the ruptured and delaminated regions of typical impact-damaged specimens; and Whether water migrates into and out of damaged regions during freeze-thaw cycling.
Experimental Investigation of the Interaction of Moisture, Low Temperature, and Low Level Impact on Graphite/Epoxy Composites
Author: K. N. Lauraitis
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
Book Description
Effect of low speed impact damage on composite materials is a new and potentially significant design condition for high performance systems. In metallic structure, damage due to tool drop, small rock impact and hail (while on the ground) did not constitute a damage of major concern. However, composites generally exhibit little inelastic ductility, are sensitive to secondary stresses, and are susceptible to splitting and delamination with cracks often propagating in the fiber direction through debonding. Upon failure, energy absorption is low. Due to these fracture characteristics and the low strain to failure, composite materials generally exhibit lower impact resistance than the metals typically used for aircraft construction. Environmental exposure may aggravate the deleterious effects of impact damage. It is well known that the mechanical properties of a polymeric matrix are susceptible to environmental degradation. Matrix cracking resulting from impact, loading or thermal cycling may provide pathways for moisture which can enter by laminar flow much more rapidly than by diffusion upon subsequent exposure to high humidity environment. Detrimental effects may also be expected because the internal tensile stress in the matrix increases with decreasing temperature, promoting crazing and the formation of microvoids.
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
Book Description
Effect of low speed impact damage on composite materials is a new and potentially significant design condition for high performance systems. In metallic structure, damage due to tool drop, small rock impact and hail (while on the ground) did not constitute a damage of major concern. However, composites generally exhibit little inelastic ductility, are sensitive to secondary stresses, and are susceptible to splitting and delamination with cracks often propagating in the fiber direction through debonding. Upon failure, energy absorption is low. Due to these fracture characteristics and the low strain to failure, composite materials generally exhibit lower impact resistance than the metals typically used for aircraft construction. Environmental exposure may aggravate the deleterious effects of impact damage. It is well known that the mechanical properties of a polymeric matrix are susceptible to environmental degradation. Matrix cracking resulting from impact, loading or thermal cycling may provide pathways for moisture which can enter by laminar flow much more rapidly than by diffusion upon subsequent exposure to high humidity environment. Detrimental effects may also be expected because the internal tensile stress in the matrix increases with decreasing temperature, promoting crazing and the formation of microvoids.
Technical Abstract Bulletin
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 220
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 220
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 602
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 602
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Advanced Composite Materials and Structures
Author: George C. Sih
Publisher: VSP
ISBN: 9789067640831
Category : Science
Languages : en
Pages : 822
Book Description
Through interviews with people in the jobs we learn what their job involves. What types of food outlets, what qualities are needed in different jobs. Jobs looked at include: cook, chef, waitress, waiter, counter attendant, short order cook, hostess, etc.
Publisher: VSP
ISBN: 9789067640831
Category : Science
Languages : en
Pages : 822
Book Description
Through interviews with people in the jobs we learn what their job involves. What types of food outlets, what qualities are needed in different jobs. Jobs looked at include: cook, chef, waitress, waiter, counter attendant, short order cook, hostess, etc.
Composite Material Response
Author: George C. Sih
Publisher: Springer
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 204
Book Description
Proceedings of a workshop on Composite Material Response: Constitutive Relations and Damage Mechanisms, held at the Stakis Grosvenor Hotel, Glasgow, UK, 30-31 July 1987
Publisher: Springer
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 204
Book Description
Proceedings of a workshop on Composite Material Response: Constitutive Relations and Damage Mechanisms, held at the Stakis Grosvenor Hotel, Glasgow, UK, 30-31 July 1987
Monthly Catalogue, United States Public Documents
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1094
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1094
Book Description
Monthly Catalog of United States Government Publications
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1094
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1094
Book Description
Government Reports Annual Index
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1146
Book Description
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1146
Book Description
Government Reports Announcements & Index
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1264
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1264
Book Description