scholarly journals An experimental method to determine the intralaminar fracture toughness of high-strength carbon-fibre reinforced composite aerostructures

2018 ◽  
Vol 122 (1255) ◽  
pp. 1352-1370 ◽  
Author(s):  
H. Liu ◽  
B.G. Falzon ◽  
G. Catalanotti ◽  
W. Tan
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Crack Tip ◽  
Damage Mechanism ◽  
Calibration Method ◽  
Compact Tension ◽  
Tensile Fracture ◽  
High Tensile Strength ◽  
Physical Test ◽  
Area Method

ABSTRACTCarbon fibres with high tensile strength are being increasingly utilised in the manufacture of advanced composite aerostructures. A Modified Compact Tension (MCT) specimen is often deployed to measure the longitudinal intralaminar fracture toughness but a high tensile strength often leads to premature damage away from the crack tip. We present an approach whereby the MCT specimen is supported by external fixtures to prevent premature damage. In addition, we have developed a novel measurement technique, based on the fibre failure strain and C-scanning, to determine the crack length in the presence of surface sublaminate delamination which masks the crack tip location. A set of cross-ply specimens, with a ((90/0)s)4 layup, were manufactured from an IMS60/epoxy composite system Two different data reduction schemes, compliance calibration and the area method, are used to determine the fibre-dominated initiation and propagation intralaminar fracture toughness values. Propagation values of fracture toughness were measured at 774.9 ± 5.2% kJ/m2 and 768.5 ± 4.1% kJ/m2, when using the compliance calibration method and the area method, respectively. Scanning Electron Microscopy (SEM) is carried out on the fracture surface to obtain insight into the damage mechanism of high-tensile-strength fibre-reinforced unidirectional composites. The measured tensile fracture toughness value is used in a fully validated computational model to simulate the physical test.

VASCO 9-4-20

Alloy Digest ◽  
1997 ◽  
Vol 46 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
High Temperature ◽  
Ultimate Tensile Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Tensile Strength ◽  
Temperature Performance

Abstract Vasco 9-4-20 (0.20 wt% C) is a premium quality aircraft steel that combines high tensile strength with good fracture toughness. It is a heat-treatable alloy capable of developing an ultimate tensile strength greater than 190 ksi. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as heat treating, machining, and joining. Filing Code: SA-489. Producer or source: Vasco, An Allegheny Teledyne Company.

AISI TYPE 201

Alloy Digest ◽  
1965 ◽  
Vol 14 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Cold Working ◽  
Heat Treating ◽  
Manganese Steel ◽  
High Tensile Strength ◽  
Steel Mills ◽  
Temperature Performance ◽  
Aisi Type ◽  
Nickel Manganese

Abstract AISI 201 is a non-hardenable austenitic chromium-nickel-manganese steel, capable of easily attaining high tensile strength and excellent ductility by moderate or severe cold working. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness and creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-174. Producer or source: Alloy steel mills and foundries.

PEERLESS 56

Alloy Digest ◽  
1964 ◽  
Vol 13 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Physical Properties ◽  
Heat Treating ◽  
High Tensile Strength ◽  
Steel Company ◽  
Extrusion Dies ◽  
Hot Work Steel ◽  
Crucible Steel

Abstract Peerless 56 was designed as an improved low-alloy hot-work steel possessing a combination of high tensile strength and hardness with roughness. It is recommended for extrusion dies, hot billet shears and hot work punches. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-149. Producer or source: Crucible Steel Company of America.

ENDURO 201

Alloy Digest ◽  
1957 ◽  
Vol 6 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Compressive Strength ◽  
Cold Working ◽  
Heat Treating ◽  
Manganese Steel ◽  
High Tensile Strength ◽  
Temperature Performance ◽  
Nickel Manganese

Abstract ENDURO 201 is a non-hardenable austenitic chromium-nickel-manganese steel, capable of easily attaining high tensile strength and excellent ductility by moderate or severe cold working. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness and creep. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-58. Producer or source: Stainless steel foundries.

Simultaneously achieving high tensile strength and fracture toughness of Ti/Ti-Al multilayered composites

2017 ◽  
Vol 90 ◽  
pp. 16-22 ◽  
Author(s):  
Shaoyuan Lyu ◽  
Yanbo Sun ◽  
Lei Ren ◽  
Wenlong Xiao ◽  
Chaoli Ma
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
High Tensile Strength ◽  
Multilayered Composites

Effect of Bond Thickness on the Fracture Toughness of Adhesive Joints

2004 ◽  
Vol 126 (1) ◽  
pp. 14-18 ◽  
Author(s):  
Deok-Bo Lee ◽  
Toru Ikeda ◽  
Noriyuki Miyazaki ◽  
Nak-Sam Choi
Keyword(s):  
Fracture Toughness ◽  
Adhesive Joint ◽  
Damage Zone ◽  
Crack Tip ◽  
Adhesive Layer ◽  
Compact Tension ◽  
Optical Microscope ◽  
Adhesive Joints ◽  
Adhesive Layers ◽  
Modified Epoxy

The effect of bond thickness on the fracture toughness of adhesive joints was investigated from a microstructural perspective, using compact tension (CT) adhesive-joint specimens with different bond thicknesses. The adhesive material was a rubber-modified epoxy resin with 12.5 wt% carboxy-terminated butadiene acrylonitrile (CTBN) elastomer. The shapes of the rubber particles dispersed in adhesive layers of damaged and undamaged specimens were observed with an optical microscope. The damage was distributed along the interfaces between the adhesive layer and the two adherends. The results show that the primary causes of variations in the fracture toughness of an adhesive joint with the bond thickness are not only a damage zone around a crack tip but also the combination of a damage zone around a crack tip and additional damage zones along the interfaces.

Effect of Stepped Aging Treatment on Microstructure and Properties of AA7085 Aluminum Alloy

2011 ◽  
Vol 228-229 ◽  
pp. 968-974 ◽  
Author(s):  
Chun Mei Li ◽  
Zhi Qian Chen ◽  
Su Min Zeng ◽  
Nan Pu Cheng ◽  
Quan Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Conductivity ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Aging Treatment ◽  
Tensile Fracture ◽  
X Ray ◽  
Thermodynamic Factors

The effect of stepped aging treatment including two-stepped retrogression aging and retrogression reaging treatment on the mechanical properties, electrical conductivity and the microstructure of AA7085 has been investigated. Electron microscopy observations were used to analyze the microstructures and tensile fracture surfaces of AA7085 processed via various treatment schedules. Besides, X-ray diffractometer and differential scanning calorimeter were used to explore the thermodynamic factors of heat treatment. Through the investigation of the effect of the retrogression time on the properties and microstructure of AA7085, the optimized retrogression time was confirmed. The results of comparing retrogression aging and retrogression reaging treatment showed that through RRA treatment, higher conductivity and fracture toughness were gained. Through the optimized RRA treatment based on appropriate retrogression time, the tensile strength, elongation, fracture toughness and conductivity of AA7085 were raised to 660MPa, 12%,36.6MPa•m1/2and 38.1%IACS.

VASCO 9-4-30

Alloy Digest ◽  
1997 ◽  
Vol 46 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Shear Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Tensile Strength ◽  
Temperature Performance

Abstract Vasco 9-4-30 (0.30 wt% C) is a premium quality aircraft steel which combines high tensile strength with good fracture toughness. It is a heat treatable alloy capable of developing ultimate tensile strengths greater than 250 ksi. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fracture toughness. It also includes information on high temperature performance as well as heat treating, machining, and joining. Filing Code: SA-491. Producer or source: Vasco, An Allegheny Teledyne Company.

RYCROME

Alloy Digest ◽  
1953 ◽  
Vol 2 (3) ◽  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
High Temperature ◽  
Impact Resistance ◽  
Heat Treating ◽  
High Tensile Strength ◽  
Temperature Performance ◽  
Heat Treated ◽  
Steel Heat

Abstract RYCROME is a chromium-molybdenum alloy steel heat treated to definite minimum mechanical properties. The combination of high tensile strength and good ductility give this alloy good shock and impact resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-8. Producer or source: Joseph T. Ryerson & Son Inc. (Distributor).

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