Fatigue Under Wide Band Random Stresses Using the Rain-Flow Method

1977 ◽  
Vol 99 (3) ◽  
pp. 205-211 ◽  
Author(s):  
P. H. Wirsching ◽  
A. Mohsen Shehata
Keyword(s):  
Fatigue Behavior ◽  
Design Procedure ◽  
Random Variable ◽  
Wide Band ◽  
Stress Process ◽  
Structural Elements ◽  
Constant Amplitude ◽  
Design Algorithm ◽  
Flow Method ◽  
Fatigue Design

A fatigue design procedure is proposed for the structural elements subjected to a stress process, modeled as stationary wide-band gaussian. This procedure, restricted to high cycle fatigue design, uses available constant amplitude material fatigue data and a modified, probability based, Palmgren-Miner (PM) rule. Statistical uncertainty in fatigue behavior and nonstatistical uncertainty in the PM rule are implicitly accounted for by treating the PM index at failure as a random variable. The rain flow method of counting stress cycles is used. The fatigue design algorithm requires only that the RMS and irregularity factor of the stress process be specified in addition to the constant amplitude S-N curve for the material.

STRUCTURAL RELIABILITY ANALYSIS BASED ON P-BOXES

2020 ◽  
Vol 92 (6) ◽  
pp. 51-58
Author(s):  
S.A. SOLOVYEV ◽  
Keyword(s):  
Probability Distribution ◽  
Reliability Analysis ◽  
Structural Reliability ◽  
Epistemic Uncertainty ◽  
Random Variable ◽  
Strength Criterion ◽  
Structural Elements ◽  
Structural Element ◽  
Limit States ◽  
Distribution Shape

The article describes a method for reliability (probability of non-failure) analysis of structural elements based on p-boxes. An algorithm for constructing two p-blocks is shown. First p-box is used in the absence of information about the probability distribution shape of a random variable. Second p-box is used for a certain probability distribution function but with inaccurate (interval) function parameters. The algorithm for reliability analysis is presented on a numerical example of the reliability analysis for a flexural wooden beam by wood strength criterion. The result of the reliability analysis is an interval of the non-failure probability boundaries. Recommendations are given for narrowing the reliability boundaries which can reduce epistemic uncertainty. On the basis of the proposed approach, particular methods for reliability analysis for any structural elements can be developed. Design equations are given for a comprehensive assessment of the structural element reliability as a system taking into account all the criteria of limit states.

Constant-amplitude fatigue behavior of M24 high-strength bolt of end-plate flange connection

Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 2041-2053
Author(s):  
Jinfeng Jiao ◽  
Zhanxiang Liu ◽  
Qi Guo ◽  
Yong Liu ◽  
Honggang Lei
Keyword(s):  
Fatigue Behavior ◽  
High Strength ◽  
Constant Amplitude ◽  
Flange Connection ◽  
End Plate ◽  
High Strength Bolt

scholarly journals Model fatigue test result of welded structural element and proposal for fatigue design procedure

1991 ◽  
Vol 1991 (170) ◽  
pp. 723-735
Author(s):  
Ryuichi Nagamoto ◽  
Masaaki Matoba ◽  
Tetsuro Kawasaki ◽  
Katsuaki Inoue ◽  
Tohru Hori ◽  
...  
Keyword(s):  
Fatigue Test ◽  
Design Procedure ◽  
Structural Element ◽  
Fatigue Design ◽  
Test Result

A Differential UWB Quasi-Yagi Antenna with A Reconfigurable Notched Band

Frequenz ◽  
2018 ◽  
Vol 72 (9-10) ◽  
pp. 401-406 ◽  
Author(s):  
Feng Wei ◽  
Xin Tong Zou ◽  
Xin Yi Wang ◽  
Bin Li ◽  
Xi Bei Zhao
Keyword(s):  
Microstrip Line ◽  
Design Procedure ◽  
Wide Band ◽  
Impedance Bandwidth ◽  
Differential Mode ◽  
Transition Structure ◽  
Notched Band ◽  
Quarter Wavelength ◽  
Yagi Antenna ◽  
Good Agreement

Abstract A compact differential ultra-wide band (UWB) planar quasi-Yagi antenna is presented in this paper. The proposed antenna consists of a balanced stepped-impedance microstrip-slotline transition structure, a driver dipole and one parasitic strip. A wide differential-mode (DM) impedance bandwidth covering from 3.8 to 9.5 GHz is realized. Meanwhile, a high and wideband common-mode (CM) suppression can be achieved by employing the balanced stepped-impedance microstrip-slotline transition structure. It is noted that the DM passband is independent from the CM response, which can significantly simplify the design procedure. In addition, a reconfigurable sharp DM notched band from 5.6 to 6.7 GHz is generated by adding one pair of quarter-wavelength varactor-loaded short-circuited stubs adjacent to the microstrip line symmetrically. In order to illustrate the effectiveness of the design, two prototypes of the antennas are designed, fabricated, and measured. A good agreement between the simulated and measured results is observed.

Constant-Amplitude Fatigue Behavior of Five Carbon or Low-Alloy Cast Steels at Room Temperature and −45°C

2008 ◽  
pp. 140-140-21 ◽  
Author(s):  
RI Stephens ◽  
JH Chung ◽  
SG Lee ◽  
HW Lee ◽  
A Fatemi ◽  
...  
Keyword(s):  
Room Temperature ◽  
Fatigue Behavior ◽  
Constant Amplitude ◽  
Cast Steels ◽  
Alloy Cast
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