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Experimental Designs01:16

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An experimental design is a systematic process that allows researchers to evaluate the relationship between dependent and independent variables. There are three widely used types of experimental design - pre-experimental design, true experimental design, and quasi-experimental design. In pre-experimental design, the researcher compares the data before and after some interventions or treatments. The true-experimental design has more than one purposefully created group, a commonly measured...
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Body:Bioequivalence experimental study designs play a pivotal role in testing the effectiveness of various treatments. Key among these are the repeated measures, cross-over, carry-over, and Latin square designs. In the repeated measures design, each subject receives all treatments, allowing for temporal comparisons. This type of design is useful in reducing variability but requires careful planning to avoid bias.The cross-over design, an economical method, involves sequential administration of...
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Related Experiment Video

Updated: Feb 26, 2026

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
09:46

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

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Insights into Cruciform Sample Design.

A Creuziger1, M A Iadicola2, T Foecke2

  • 1National Institute of Standards and Technology (NIST), Materials Science and Engineering Division, 100 Bureau Dr., Gaithersburg, MD USA 20899.8553.

JOM (Warrendale, Pa. : 1989)
|July 26, 2017
PubMed
Summary
This summary is machine-generated.

This study examined cruciform sample designs with unique pockets, revealing two failure mechanisms. Optimizing the balance between stress concentrations and strain constraints is crucial for preventing premature sample failure.

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Area of Science:

  • Mechanical Engineering
  • Materials Science

Background:

  • Cruciform sample designs are utilized in mechanical testing.
  • Previous work by Abu-Farha et al. established foundational designs.

Purpose of the Study:

  • To investigate the performance of four distinct cruciform sample designs.
  • To analyze the strain distribution and failure mechanisms within these samples.

Main Methods:

  • Digital image correlation (DIC) was employed to measure strain.
  • Four variations of a cruciform sample with recessed pockets, fillets, and re-entrant corners were tested.

Main Results:

  • Significant differences in strain values were observed inside and outside the pocket regions.
  • Two primary competing failure mechanisms were identified: stress concentrations at the fillet and strain constraints from re-entrant notches.
  • The interplay between these mechanisms dictates sample performance.

Conclusions:

  • The design of cruciform samples significantly influences strain distribution and failure modes.
  • Understanding and balancing stress concentrations and strain constraints are critical for successful sample design and testing.
  • This research provides insights into optimizing sample geometry for reliable mechanical characterization.