Modeling of Stiffness Reduction of Vibration Conveyor Springs Subjected to Ultra High Cyclic Loading under High Humidity

2011 ◽  
Vol 471-472 ◽  
pp. 975-980
Author(s):  
Takahiko Yoshi ◽  
Kazuya Okubo ◽  
Toru Fujii
Keyword(s):  
Crack Propagation ◽  
Creep Deformation ◽  
Crack Tip ◽  
Time Dependent ◽  
High Humidity ◽  
Humidity Condition ◽  
Stiffness Reduction ◽  
Carbon Fiber Cloth ◽  
Plate Spring ◽  
High Humidity Condition

Significant stiffness reduction of the plate spring due to delaminations around the interwoven cloths could be prevented by using CFRTP (carbon fiber cloth and Polyethylene Terephthalate (PET)) rather than that by using CFRP (carbon fiber cloth and epoxy), when ultra high cyclic loading was applied to the plate spring under high humidity condition. To explain the result, the prediction model of stiffness reduction was introduced considering time-dependent crack propagation accompanying with creep deformation around the crack tip. Stiffness reduction of CFRP under high humidity condition was not only determined by cyclic crack propagation but also by time-dependent crack propagation accompanying with creep deformation around the crack tip. It was found that CFRTP was effective material of the plate springs on vibration conveyer for the uses under high humidity condition to prevent significant stiffness reduction, where the crack propagation accompanying with creep deformation should be prevented around the crack tip.

Stiffness Reduction of Woven CFRP and CFRTP Spring under Ultra High Cyclic Fatigue for Vibration Conveyor

2010 ◽  
Vol 123-125 ◽  
pp. 217-220 ◽  
Author(s):  
Takahiko Yoshi ◽  
Kazuya Okubo ◽  
Toru Fujii
Keyword(s):  
Cyclic Loading ◽  
Relative Humidity ◽  
Fatigue Loading ◽  
Cyclic Fatigue ◽  
High Relative Humidity ◽  
Carbon Cloth ◽  
High Humidity ◽  
Stiffness Reduction ◽  
Plate Spring ◽  
High Humidity Condition

This paper investigated the stiffness reduction of the plate spring made of CFRP (Carbon cloth and epoxy) subjected to ultra high cyclic fatigue loading under high relative humidity. For practical uses, this paper proposes a new design which prevents the significant degradation with stiffness change of the plate spring at high humidity. Remarkable stiffness reduction of the plate spring due to cracks and delaminations around inter layer could be prevented by using CFRTP rather than that by using CFRP, when ultra high cyclic loading was applied to the plate spring under high humidity condition.

Study of interaction between polyimide and Cu under a high humidity condition

2001 ◽  
Vol 171 (1-2) ◽  
pp. 101-105 ◽  
Author(s):  
N. Nagai ◽  
T. Hironaka ◽  
T. Imai ◽  
T. Harada ◽  
M. Nishimura ◽  
...  
Keyword(s):  
High Humidity ◽  
Humidity Condition ◽  
High Humidity Condition

Evaluation method for thermal protection of firefighters’ clothing in high-temperature and high-humidity condition

2016 ◽  
Vol 28 (4) ◽  
pp. 429-448 ◽  
Author(s):  
Yun Su ◽  
Yunyi Wang ◽  
Jun Li
Keyword(s):  
High Temperature ◽  
Protective Clothing ◽  
Thermal Protection ◽  
Evaluation Methods ◽  
Moisture Distribution ◽  
High Humidity ◽  
Thermal Hazards ◽  
Content Type ◽  
Humidity Condition ◽  
High Humidity Condition

Purpose – The purpose of this paper is to provide the details of developments to researchers in test apparatus and evaluation methods to rate the thermal protective performance (TPP) of firefighters’ clothing under high-temperature and high-humidity condition. Design/methodology/approach – This review paper describes the influence laws of moisture on thermal protection and the moisture distribution in actual fire environment. Different evaluation methods used for assessing the effect of moisture on the TPP were investigated, with an emphasis on test devices, evaluation indexes as well as their relationship and limitations. Findings – The moisture from the ambient, clothing and human perspiration plays an important role in determining the TPP of firefighter protective clothing. It is obvious that research on moisture-driven heat transfer in firefighter’s clothing system are comparatively little, primarily focussing on pre-wetted methods of multi-layer fabric. Further studies should be conducted to develop more standardized moistening systems and improve the current calculation methods for evaluating the performance of protective clothing. New explorations for heat and moisture transfer mechanism in protective clothing should be investigated. Practical implications – Protective clothing is the efficient way to provide fire-fighting occupational safety. To accurately evaluate the TPP of protective clothing under high-temperature and high-humidity condition will help to optimize the clothing performance and choose the proper clothing for providing firefighters with the best protection under multiple thermal hazards. Originality/value – This paper is offered as a concise reference for scientific community further research in the area of the TPP evaluation methods under high-temperature and high-humidity condition.

Cesium Lead Halide Inorganic-Based Perovskite-Sensitized Solar Cell for Photo-Supercapacitor Application under High Humidity Condition

2018 ◽  
Vol 1 (2) ◽  
pp. 692-699 ◽  
Author(s):  
Chi Huey Ng ◽  
Hong Ngee Lim ◽  
Shuzi Hayase ◽  
Zulkarnain Zainal ◽  
Suhaidi Shafie ◽  
...  
Keyword(s):  
Solar Cell ◽  
High Humidity ◽  
Supercapacitor Application ◽  
Humidity Condition ◽  
Lead Halide ◽  
High Humidity Condition

Full Scale Testing of a Cluster Nozzle Burner for the Advanced Humid Air Turbine

2007 ◽  
Author(s):  
Tomomi Koganezawa ◽  
Keisuke Miura ◽  
Takeo Saito ◽  
Kazuki Abe ◽  
Hiroshi Inoue
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Pilot Plant ◽  
Flame Temperature ◽  
Nox Emission ◽  
Flame Stability ◽  
High Humidity ◽  
Humidity Condition ◽  
Air Turbine ◽  
High Humidity Condition

The advanced humid air turbine (AHAT) system, which has a humidifier and a heat recovery system has the advantage of improving the thermal efficiency of gas turbine power generation without needing an extremely high firing temperature and pressure ratio. A pilot plant and a prototype gas turbine adapted to the AHAT system have been developed. Before the pilot plant test, an experimental study using a combustion test rig was carried out to obtain the characteristics of a prototype combustor and it is described in this presentation. The combustion conditions in the AHAT system are characterized by both high humidity and high temperature air (17.6wt%, 629C). It is expected that a low flame temperature caused by the high humidity condition will decrease NOx emission while the high temperature air condition will sustain flame stability. However, the latter condition has the disadvantage of causing NOx emission and autoignition of fuel. A cluster nozzle burner configuration, which has many fuel and air coaxial jet streams, was previously proposed. The cluster nozzle burner can mix fuel and air effectively within a short time which makes it suited to the AHAT system and able to cope with both flame stability and NOx reduction problems. The combustion rig test results showed good combustion performance for the developed cluster nozzle burner. Both the high temperature condition of the AHAT system and the recirculation zone generated by swirling of center burner air sustained flame stability at a level sufficient for the nozzle burner in AHAT operation. The low flame temperature due to the high humidity condition was effective in decreasing NOx emission, which was less than 10ppm at 50-100% load.

scholarly journals High Humidity Causes Abnormalities in the Process of Appressorial Formation of Blumeria graminis f. sp. hordei

Pathogens ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 45
Author(s):  
Koreyuki Sugai ◽  
Hiroshi Inoue ◽  
Chie Inoue ◽  
Mayuko Sato ◽  
Mayumi Wakazaki ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Germ Tube ◽  
Penetration Rate ◽  
Blumeria Graminis ◽  
High Humidity ◽  
Appressorium Formation ◽  
Humidity Condition ◽  
Barley Powdery Mildew ◽  
Low Humidity ◽  
High Humidity Condition

High humidity decreases the penetration rate of barley powdery mildew Blumeria graminis f. sp. hordei. However, the mechanism is not well understood. In this study, the morphological and cytochemical analyses revealed that substances containing proteins leaked from the tip of the appressorial germ tube of conidia without the formation of appressorium under a high humidity condition. In addition, exposure to high humidity prior to the formation of appressorium caused the aberrant formation of the appressorial germ tube without appressorium formation, resulting in failure to penetrate the host cell. These findings suggest that the formation and maturation of the appressorium requires a low humidity condition, and will be clues to improve the disease management by humidity control.

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