In-Situ Tensile Damage and Fracture Behavior of PIP SiC/SiC Minicomposites at Room Temperature

2021 ◽  
Author(s):  
Haitang Yang ◽  
Shenwei Xu ◽  
Daxu Zhang ◽  
Longbiao Li ◽  
Xiaozhong Huang
Keyword(s):  
Fracture Behavior ◽  
Room Temperature ◽  
Damage And Fracture ◽  
Tensile Damage

Nanoindentation and Bending Fracture Behavior of Flexible Sulfide Thin Films Grown at Near Room Temperature With in Situ Tensile/Compressive Stress

2019 ◽  
Vol 21 (7) ◽  
pp. 1801329 ◽  
Author(s):  
Da Bin Kim ◽  
Seung Min Lee ◽  
Jin Woo Jang ◽  
Bhaskar Chandra Mohanty ◽  
Yong Soo Cho
Keyword(s):  
Thin Films ◽  
Compressive Stress ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Bending Fracture

Size-dependent fracture behavior of GaN pillars under room temperature compression

Nanoscale ◽  
2020 ◽  
Vol 12 (45) ◽  
pp. 23241-23247
Author(s):  
Sufeng Fan ◽  
Xiaocui Li ◽  
Rong Fan ◽  
Yang Lu
Keyword(s):  
Fracture Behavior ◽  
Room Temperature ◽  
Power Device ◽  
Compression Tests ◽  
Single Crystalline ◽  
Size Dependent ◽  
Electron Microscopes

Single crystalline GaN pillars are characterized by in situ compression tests inside electron microscopes, showing distinct size-dependent fracture behavior at room temperature for potential microelectronics, power device and MEMS applications.

scholarly journals Damage Evolution and Fracture Behavior of C/SiC Minicomposites with Different Interphases under Uniaxial Tensile Load

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1525
Author(s):  
Zhongwei Zhang ◽  
Longbiao Li ◽  
Zhaoke Chen
Keyword(s):  
Damage Evolution ◽  
Fracture Behavior ◽  
Crack Opening ◽  
Tensile Load ◽  
Image Correlation ◽  
Matrix Cracking ◽  
Elastic Response ◽  
Uniaxial Tensile ◽  
Damage And Fracture ◽  
Tensile Damage

In this paper, the tensile damage and fracture behavior of carbon fiber reinforced silicon carbide (C/SiC) minicomposites with single- and multiple-layer interphases are investigated. The effect of the interphase on the tensile damage and fracture behavior of C/SiC minicomposites is analyzed. The evolution of matrix cracking under the tensile load of the C/SiC minicomposite with a notch is observed using the digital image correlation (DIC) method. The damage evolution process of the C/SiC minicomposite can be divided into four main stages, namely, (1) an elastic response coupled with partial re-opening of thermal microcracking; (2) multiple matrix microcracking perpendicular to the applied loading; (3) crack opening and related fiber/matrix, bundle/matrix, and inter-bundle debonding; and (4) progressive transfer of the load to the fibers and gradual fiber failure until composite failure/fracture. On the fracture surface, a large number of fibers pulling out of the samples with both single-layer and multi-layer interphases can be clearly observed.

Tensile and Fracture Behavior of NbSS/Nb5Si3 In Situ Composites Prepared by Arc Melting

2005 ◽  
Vol 297-300 ◽  
pp. 507-514
Author(s):  
Jin Hak Kim ◽  
Tatsuo Tabaru ◽  
Michiru Sakamoto ◽  
Shuji Hanada
Keyword(s):  
Base Composition ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Secondary Phase ◽  
Secondary Phases ◽  
In Situ Composites ◽  
Arc Melting ◽  
Negative Effect ◽  
Base Composite

Nb-base in-situ composites, which have the base composition of Nb-18Si-5Mo-5Hf, have been investigated in microstructure, hardness (Hv*), Young’s modulus (E), tensile properties and fracture behavior. The microstructures of all composites examined consist of NbSS matrix and Nb5Si3 secondary phases. No secondary phase such as Nb2C appeared. The crystal structure of Nb5Si3 is Mn5Si3-type when C replaces 2mol%-Nb, though typical structures of a (Cr5B3-type) and b (W5Si3-type) as in the base composition when W replaces. W addition is effective in increasing Hv* and E of both phases as expected. However, C alloying is somewhat beneficial only in Nb5Si3 with a noticeable negative effect in NbSS. Furthermore, the composite exhibits the highest strength at 1473 K, while the base composite exhibits the highest at room temperature. The fracture behavior is independent of the compositions and it is controlled by cleavage fractures of Nb5Si3, decohesion of NbSS/Nb5Si3 interface and ductile rupture of NbSS depending on the testing temperatures.

scholarly journals Modeling Tensile Damage and Fracture Behavior of Fiber-Reinforced Ceramic-Matrix Minicomposites

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4313
Author(s):  
Zhongwei Zhang ◽  
Yufeng Liu ◽  
Longbiao Li ◽  
Daining Fang
Keyword(s):  
Fracture Behavior ◽  
Tensile Load ◽  
Nonlinear Behavior ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Fiber Reinforced ◽  
Internal Damage ◽  
Damage Mechanisms ◽  
Damage And Fracture ◽  
Tensile Damage

Evolution of damage and fracture behavior of fiber-reinforced mini ceramic-matrix composites (mini-CMCs) under tensile load are related to internal multiple damage mechanisms, i.e., fragmentation of the brittle matrix, crack defection, and fibers fracture and pullout. In this paper, considering multiple micro internal damage mechanisms and related models, a micromechanical constitutive stress–strain relationship model is developed to predict the nonlinear mechanical behavior of mini-CMCs under tensile load corresponding to different damage domains. Relationships between multiple micro internal damage mechanisms mentioned above and tensile micromechanical multiple damage parameters are established. Experimental tensile nonlinear behavior, internal damage evolution, and micromechanical tensile damage parameters corresponding to different damage domains of two different types of mini-CMCs are predicted. The effects of constitutive properties and damage-related parameters on nonlinear behavior of mini-CMCs are discussed.

Fracture Toughness and the Effects of Stress State on Fracture of Nickel Aluminides

1990 ◽  
Vol 186 ◽  
Author(s):  
John J. Lewandowski ◽  
Gary M. Michal ◽  
Ivan Locci ◽  
Joseph D. Rigney
Keyword(s):  
Stress State ◽  
Hydrostatic Pressure ◽  
Tensile Testing ◽  
Fracture Behavior ◽  
Room Temperature ◽  
In Situ Monitoring ◽  
High Toughness ◽  
Tension Tests ◽  
Effects Of Stress

AbstractThe effects of stress state on the fracture behavior of Ni3Al, Ni3Al + B, and NiAl were determined using either notched, or fatigue-precracked bend bars tested to failure at room temperature, in addition to testing specimens in tension under superposed hydrostatic pressure. Although Ni3AI is observed to fail in a macroscopically brittle intergranular manner in tension tests conducted at room temperature, the fracture toughnesses (i.e. K IC presently obtained on Ni3Al exceeded 20 MPa1m and R-curve behavior was exhibited. In-situ monitoring of the fracture experiments was utilized to aid in interpreting the source(s) of the high toughness in Ni3Al, while SEM fractography was utilized to determine the operative fracture modes. The superposition of hydrostatic pressure during tensile testing of NiAl specimens was observed to produce increased ductility without changing the fracture mode.

Otoconia perfect/imperfect crystals

1994 ◽  
Vol 52 ◽  
pp. 42-43
Author(s):  
César D. Fermin ◽  
Dale Martin
Keyword(s):  
Image Processing ◽  
Room Temperature ◽  
Phosphotungstic Acid ◽  
Gallus Domesticus ◽  
Crystal Matrix ◽  
Organic Templates ◽  
Image Processing Algorithms ◽  
Processing Algorithms ◽  
Diffraction Patterns

Otoconia of higher vertebrates are interesting biological crystals that display the diffraction patterns of perfect crystals (e.g., calcite for birds and mammal) when intact, but fail to produce a regular crystallographic pattern when fixed. Image processing of the fixed crystal matrix, which resembles the organic templates of teeth and bone, failed to clarify a paradox of biomineralization described by Mann. Recently, we suggested that inner ear otoconia crystals contain growth plates that run in different directions, and that the arrangement of the plates may contribute to the turning angles seen at the hexagonal faces of the crystals.Using image processing algorithms described earlier, and Fourier Transform function (2FFT) of BioScan Optimas®, we evaluated the patterns in the packing of the otoconia fibrils of newly hatched chicks (Gallus domesticus) inner ears. Animals were fixed in situ by perfusion of 1% phosphotungstic acid (PTA) at room temperature through the left ventricle, after intraperitoneal Nembutal (35mg/Kg) deep anesthesia. Negatives were made with a Hitachi H-7100 TEM at 50K-400K magnifications. The negatives were then placed on a light box, where images were filtered and transferred to a 35 mm camera as described.

In Situ Localization of PPAR Gamma and Uncoupling Protein in Mouse Embryo Sections Using Digoxigenin-Labeled Riboprobes

1996 ◽  
Vol 54 ◽  
pp. 32-33
Author(s):  
C. Jennermann ◽  
S. A. Kliewer ◽  
D. C. Morris
Keyword(s):  
Alkaline Phosphatase ◽  
Room Temperature ◽  
Uncoupling Protein ◽  
Ppar Gamma ◽  
Nuclear Hormone Receptor ◽  
Full Length ◽  
Northern Analysis ◽  
Peroxisome Proliferator

Peroxisome proliferator-activated receptor gamma (PPARg) is a member of the nuclear hormone receptor superfamily and has been shown in vitro to regulate genes involved in lipid metabolism and adipocyte differentiation. By Northern analysis, we and other researchers have shown that expression of this receptor predominates in adipose tissue in adult mice, and appears first in whole-embryo mRNA at 13.5 days postconception. In situ hybridization was used to find out in which developing tissues PPARg is specifically expressed.Digoxigenin-labeled riboprobes were generated using the Genius™ 4 RNA Labeling Kit from Boehringer Mannheim. Full length PPAR gamma, obtained by PCR from mouse liver cDNA, was inserted into pBluescript SK and used as template for the transcription reaction. Probes of average size 200 base pairs were made by partial alkaline hydrolysis of the full length transcripts. The in situ hybridization assays were performed as described previously with some modifications. Frozen sections (10 μm thick) of day 18 mouse embryos were cut, fixed with 4% paraformaldehyde and acetylated with 0.25% acetic anhydride in 1.0M triethanolamine buffer. The sections were incubated for 2 hours at room temperature in pre-hybridization buffer, and were then hybridized with a probe concentration of 200μg per ml at 70° C, overnight in a humidified chamber. Following stringent washes in SSC buffers, the immunological detection steps were performed at room temperature. The alkaline phosphatase labeled, anti-digoxigenin antibody and detection buffers were purchased from Boehringer Mannheim. The sections were treated with a blocking buffer for one hour and incubated with antibody solution at a 1:5000 dilution for 2 hours, both at room temperature. Colored precipitate was formed by exposure to the alkaline phosphatase substrate nitrobluetetrazoliumchloride/ bromo-chloroindlylphosphate.

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