CHE 3265 Florida Institute of Technology Creep Lab Report

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CHE 3265

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Florida Institute of Technology-Melbourne

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CHE 3265 Lab: Creep lab GSA: Deena Rose Dunkley Student: Mohammed Hawsawi April 07, 2022 Introduction: Creep occurs whenever a substance is subjected to steady static stress at a temperature higher than one-third of its melting point. This laboratory experiment aims to investigate substance creep activity utilizing DR. Engblom's plastic wood experiment, which is made up of plastic plus wood flakes. In-room temperature, Engblom's specimen achieves a third of its melting point. Procedure: Fig1: The set up of this experiment [Canvas, Deena) Fig2: The dial gauge [Canvas, Deena] The initial procedure was to secure the specimen on the equipment shown in Figure 1 in order to provide continuous static stress to Dr. Engblom's wood sample with a Jominy bar (figure 1). Therefore, the dial gauge was employed for the following stage that was measuring the deviation as a measure of duration because it was put there under specimen (figure 2). The measurements were made at various periods. The log of all measured deformation was graphed against the log of different periods to create a line having a slop = a, a parameter utilized in the expression below to determine the creep exponent (n), an estimate of creep in a sample. 𝑛 =1− 1 𝑎 It is a developed expression out from underlying complicated equation that will be utilized in this lab. 𝐸𝑐𝑟𝑒𝑒𝑝 𝑑𝑒 = 𝐾𝜎 𝑛 𝑒 − 𝑅𝑇 𝑑𝑡 Where, Ecreep = Creep activation energy T = Temperature 𝜎 = stress Ecreep, K, and n = the experiment determined constants. Results: Creep of Prof. Engblom's Plastic Wood Deflection (inches) 0.10 0.01 1 10 Time (sec) 100 Plot1: Creep Plot [Canvas, Deena] The log of all collected detachments was displayed versus the log of the frequency ranges employing excel, as indicated in the process part. By using linear regression, the deviation of the line displayed in the figure is determined to be 0.013. Upon putting in the deviation as (a) in the above-mentioned calculated expression for creep. The result of the creep exponent as a consequence is -75.92. Because the sample was created by one of Florida Tech's professors, the numbers would not be evaluated to any literary values. Discussion: The three stages of creep are temporary, steady-state, and secondary to creep explosion. Discontinuities spread to the substrate or admettre borders, causing temporary creep. This phase of creep starts immediately following the immediate distortion and lasts only a few seconds. Eventually, steady-state creep sets in, and the fissures commence to widen. The steady-state stage goes for a longer time than the temporary stage, and the creep in our experiment was largely in this period. Following that, tertiary to creep deformation occurs when the specimen undergoes plastic distortion and eventually fails. Because the slop in the graph above represents distortion against time, a slop of 0 indicates that there had been no variation in distortion throughout time, implying that no creep occurred. Because the experiment was completed in a brief amount of time, just the creep phase was recorded. It takes a long time for creeps to attain the terminal level. The temperature of the material utilized in this test was more than one-third of the melting point, which is crucial in creep. The creep exponent deviation in the test was +- 1. In both the transient and steady-state stages of the study, creep takes numerous different forms and shapes on top of the sample's surfaces. Appendix 1: Resources 1- All the pictures and plot obtained from [Canvas, Deena] Appendix 2: Sample Calculations. Creep exponent (n): = [1- (1/a)] = [1-(1/0.013)]= -75.92 The error in creep = dn = (1/a2) da = [1/0.013^2]*0.0001 = ± 0.6 Appendix 3: Data
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CHE 3265
Lab: Creep lab
GSA: Deena Rose Dunkley
Student: Mohammed Hawsawi

April 07, 2022

Introduction:
Static tension at a temperature greater than one-third of a substance's melting point causes
creep. The plastic wood experiment of DR. Engblom, which consists of plastic and wood flakes,
will be used in this laboratory experiment to study material creep action. Engblom's specimen
reaches a third of its melting point at ambient temperature.
Procedure:

Fig1: The set-up of this experiment [Canvas, Deena)

Fig2: The dial gauge [Canvas, Deena]

The first step was to attach the specimen to the apparatus seen in Figure 1 so that Dr
Engblom's ...