scholarly journals Interfacial Failure in Stitched Foam Sandwich Composites

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2275
Author(s):  
Yue Hu ◽  
Jun Zhu ◽  
Jihui Wang ◽  
Yibo Wu
Keyword(s):  
Crack Propagation ◽  
Strain Energy ◽  
Critical Strain ◽  
Peak Load ◽  
Sandwich Composite ◽  
Displacement Curve ◽  
Release Rates ◽  
Propagation Process ◽  
Crack Propagation Process ◽  
Fracture Tests

In this paper, the use of a customized automatic reinforcement stitching equipment was demonstrated. The stitching of foam sandwich composite preforms was achieved to obtain structures with improved interfacial properties. The effect of different stitching spacings on the crack propagation process in glass fiber reinforced plastics (GFRP)/foam sandwich composite interfaces was examined by Mode-I Cracked Sandwich Beam (CSB) fracture tests. The load–displacement curve, the crack propagation process, and the release rate of critical strain energy were analyzed. The CSB fracture test results show that the stitching treatment with different stitching spacings increase the peak load and fracture displacement. Furthermore, it was found that the mechanism of crack propagation is changed by the stitching process. The release rates of the critical strain energy in specimens with 0- and 10-mm stitch spacings were evenly distributed, with an average of 0.961 kJ/m2 and 1.667 kJ/m2, respectively, while the release rates of critical strain energy in specimens with 6-mm and 8-mm stitch spacings were linearly distributed. The CSB fracture tests confirmed that the best suture spacing was 8 mm. Based on these results, the mechanism of crack propagation and the toughening mechanism of the resin column could be revealed.

Numerical Simulation on the Compound Crack Propagation Process in Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 1139-1142
Author(s):  
Pei Xiu Xia ◽  
Guang Ping Zou ◽  
Li Qiang Tang
Keyword(s):  
Numerical Simulation ◽  
Crack Propagation ◽  
Failure Process ◽  
Peak Load ◽  
Propagation Path ◽  
Propagation Process ◽  
Load Increase ◽  
Crack Propagation Process ◽  
Crack Initiation Angle ◽  
Concrete Materials

In this paper, numerical simulation on the failure process of the mixed mode crack about the concrete is carried out. The results show that the crack initiation angle and the peak load increase as the distance between the preexisting crack and the midline of the beam is greater, the distance is constant, the longer the length of the preexisting crack is, the bigger the peak load is. Due to the heterogeneity of concrete materials, the crack propagation path is tortuous, and tensile stress is the major driving force.

Local strain accumulation in fatigue crack propagation process of Ti-6Al-4V alloy

2016 ◽  
Vol 40 (5) ◽  
pp. 836-849 ◽  
Author(s):  
S. Ye ◽  
J. -G. Gong ◽  
S. -T. Tu ◽  
X. -C. Zhang ◽  
C. -C. Zhang
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Local Strain ◽  
Strain Accumulation ◽  
Propagation Process ◽  
Crack Propagation Process

The Comparison of Self-Compacting Rock-Filled Concrete with Large-Size Natural and Recycled Aggregate

2014 ◽  
Vol 513-517 ◽  
pp. 20-23
Author(s):  
Hai Chao Wang ◽  
Xue Hua Wang ◽  
Xue Hui An
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Fracture Energy ◽  
Fracture Mechanism ◽  
Recycled Aggregate ◽  
Propagation Process ◽  
Fracture Characteristics ◽  
Three Point Bending ◽  
Large Size ◽  
Crack Propagation Process

The different fracture characteristics of self-compacting rock-filled concrete with large-size natural and recycled aggregate are analyzed by three-point bending experiment. According to the analysis of the crack propagation process, the fracture mechanism differences of self-compacting rock-filled concrete with large-size natural and recycled aggregate are discussed. The further analysis of the differences of fracture toughness, fracture energy, and are gain

The Series K Criterion of Unstable Fracture of Concrete and its Application

2010 ◽  
Vol 152-153 ◽  
pp. 1878-1883
Author(s):  
Ai Min Deng ◽  
Dao Yuan Xu
Keyword(s):  
Crack Length ◽  
Peak Load ◽  
Unstable Fracture ◽  
Displacement Curve ◽  
Three Gorges Project ◽  
Concrete Fracture ◽  
Nonlinear Characteristics ◽  
The Three Gorges ◽  
Fracture Tests ◽  
The Three Gorges Project

The knowledge from extensive investigations showed that the non-linearity of the load and loading point displacement curve is mainly associated with crack propagation. Based on the linear asymptotic superposition assumption, the critical effective crack length is evaluated by analyzing the nonlinear characteristics of the load and loading point displacement curves of a series of the fracture tests. Furthermore, the unstable fracture toughness is determined by inserting the peak load and the critical effective crack length into a formula developed from LEFM. Based on the calculated results, the series K criterion of unstable fracture of concrete fracture is established. At last, an engineering example of cracking analysis of the upstream lock-head foundation of the ship-lift of the Three Gorges Project is given.

1928 Evaluation of Thermal Fatigue Micro-crack Propagation Process in Flip Chip Interconnects by Synchrotron Radiation X-ray Micro-tomography

2007 ◽  
Vol 2007.7 (0) ◽  
pp. 221-222
Author(s):  
Hiroyuki Tsuritani ◽  
Toshihiko Sayama ◽  
Yoshiyuki Okamoto ◽  
Takeshi Takayanagi ◽  
Kentaro Uesugi ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Crack Propagation ◽  
Thermal Fatigue ◽  
Flip Chip ◽  
Propagation Process ◽  
X Ray ◽  
Crack Propagation Process ◽  
Micro Tomography

1035 Microscopic Observation of the Creep-Fatigue Crack Propagation Process in Lead Free Solder

2008 ◽  
Vol 2008.6 (0) ◽  
pp. 159-160
Author(s):  
Shinji SEKIGUCHI ◽  
Takuya HIRASAWA ◽  
Keisuke TANAKA ◽  
Kazunari FUJIYAMA
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Microscopic Observation ◽  
Lead Free ◽  
Lead Free Solder ◽  
Propagation Process ◽  
Creep Fatigue ◽  
Crack Propagation Process ◽  
Free Solder ◽  
Creep Fatigue Crack
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