SOURCE: Direct Measurements, Inc.

June 05, 2007 10:00 ET

Direct Measurements, Inc. Validates Cold Expansion in Aerospace Aluminum

ATLANTA, GA--(Marketwire - June 5, 2007) - Direct Measurements, Inc. (DMI) producer of systems for self-contained wire-free strain-measurement, in conjunction with the Naval Air Systems Command (NAVAIR), has successfully demonstrated a simple, yet effective validation technique for fastener-hole cold expansion in aerospace aluminum. DMI's strain measurement and strain anomaly detection technology proved an effective means of verifying cold expansion, as well as measuring the non-uniform strains near the holes resulting from the applied cold work.

DMI's technology consists of a wire-free "gage" that can be temporarily or permanently affixed to parts and equipment; an "instrument" that reads the gage; and on-board software that analyzes the gage readings. These technology elements are integrated into several DMI product lines, which perform a range of tasks from simple laboratory strain measurement to onboard structural health monitoring.

DMI's SR-2 line of strain measurement systems makes differential strain measurements within the gage area, including independent readings on the inner and outer gage boundaries. These powerful DMI SR-2 gage-analysis features enable measurement of the residual strain field imparted by cold expansion methods; a result which could lead to fatigue-life extension credit in a number of critical applications. A technical white paper describing test results of DMI'S validation of cold expansion near fastener holes in aerospace aluminum is available on DMI's website.

Maintenance-hour reduction through innovation and efficiency represents an enormous cost-savings opportunity in the commercial and defense aerospace industries, and is a key business objective of Nam Phan, NAVAIR's Head Patrol/Support/Rotary Wing Aircraft Branch. "DMI has demonstrated the potential for significantly extending service cycles through documented, validated measurement results. The Aerospace and Defense Industry could achieve cost savings on the maintenance side and increase reliability and mission readiness using DMI's cold expansion validation technology," noted Marc Wood, retired Lockheed Martin Aeronautics Company principal engineer for Structural Testing and present NAVAIR consultant.

In addition to cold expansion measurement and validation, DMI's SR-2 technology adds measurable value over a range of applications dealing with stress concentration regions on fatigue-life-limited parts and equipment.

Direct Measurements, Inc. is a privately held Georgia corporation specializing in alternative technology for strain and fatigue measurement, including cold expansion validation and structural health monitoring. More information can be found at DMI's website:

Contact Information

  • DMI Media Contact:

    Lex Pavlo