Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (7): 1598-1606.doi: 10.13229/j.cnki.jdxbgxb20210129

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Fatigue damage characteristics of ultra high toughness cementitious composite based on energy method

Zhang-yi GU(),Zhi-cheng ZHANG(),Hui LI   

  1. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou 310012，China
  • Received:2021-02-18 Online:2022-07-01 Published:2022-08-08
  • Contact: Zhi-cheng ZHANG E-mail:zhangyigu@zju.edu.cn;jszzc@zju.edu.cn

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Abstract:

Experimental study of cylindrical samples under uniaxial cyclic compression was conducted to explore the effect of loading frequency and stress level on fatigue performance of ultra high toughness cementitious composite （UHTCC） under traffic loading. The results show that accumulation rate of stress-cycle curves could be disassembled into three stage with increase in number of cycles. Meanwhile， nonlinearity of strain increases gradually. The increase of loading frequency and stress level would reduce the fatigue life of specimens. The constitutive model for UHTCC was proposed based on the basis of uniaxial compression cyclic tests. Moreover， the stress path predicted by the model is in good agreement with the experimental results， which verifies the correctness and applicability of this model. Fatigue damage propagation is characterized by dissipated strain energy （DSE） based on energy-based mechanistic approach （EBM）. The initial damage （about 2%） is obtained and the development law of fatigue damage factor is revealed. Additionly， the fatigue cracking is fast at high stress ratio.

Key words: ultra high toughness cementitious composite, energy-based mechanistic approach, constitutive model, fatigue, dissipated strain energy

CLC Number: 

  • U414

Table 1

Scheme of uniaxial compression fatigue test"

试件编组频率/Hz幅值/kN
1130
240
360
4430
540
660
7830
840
950

Fig.1

Failure of specimen"

Fig.2

Stress-strain curve under fatigue loading （60 kN）"

Fig.3

Strain curve under fatigue loading （60 kN）"

Fig.4

Comparison of fatigue and uniaxial compression"

Fig.5

Schematic diagram of loading and unloading path"

Fig.6

Comparison of test and prediction of stress path"

Fig.7

Energy comparison of each cycle loading stage （1 Hz）"

Fig.8

Energy comparison of each cycle loading stage （4 Hz）"

Fig.9

Energy comparison of each cycle loading stage （8 Hz）"

Fig.10

Initial damage based on energy"

Fig.11

Development of fatigue damage"

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