ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Elastic analysis of a mode II fatigue crack test specimen (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Elastic displacements and stress intensity measurements for a mode II specimen have been obtained over a range of a/W values between 0.500 and 0.900 using the MARC general purpose finite element program. Stress intensity factors were experimentally determined using load point displacement values. Good general agreement between numerical and experimental results for crack mouth, crack surface, and load point displacements, and for stress intensity factors, demonstrates the accuracy of the present method.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture (ISSN 0376-9429); 31; 151-157
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Monitoring crack extension in fracture toughness tests by ultrasonics (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An ultrasonic method was used to observe the onset of crack extension and to monitor continued crack growth in fracture toughness specimens during three-point bend tests. A 20-MHz transducer was used with commercially available equipment to detect average crack extension less than 0.09 mm. The material tested was a 300-grade maraging steel in the annealed condition. A crack extension resistance curve was developed to demonstrate the usefulness of the ultrasonic method for minimizing the number of tests required to generate such curves.
    Keywords: METALLIC MATERIALS
    Type: Journal of Testing and Evaluation; 4; Nov. 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Load-displacement measurement and work determination in three-point bend tests of notched or precracked specimens (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Suggestions for testing of notched or cracked three-point bend specimens are presented that (1) correct displacement measurement errors resulting from misalignment between the load applicator and specimen; (2) account for coincidental strains not associated with the work of crack extension; (3) simplify record analysis and processing; and (4) extend displacement gage range without sacrifice of sensitivity or accuracy. These testing details are particularly applicable to procedures in which the crack extension force J(I) is determined from the work done on the specimen.
    Keywords: METALLIC MATERIALS
    Type: Journal of Testing and Evaluation; 6; Jan. 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Mode II fatigue crack growth specimen development (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A Mode II test specimen was developed which has potential application in understanding phemonena associated with mixed mode fatigue failures in high performance aircraft engine bearing races. The attributes of the specimen are: it contains one single ended notch, which simplifies data gathering and reduction; the fatigue crack grows in-line with the direction of load application; a single axis test machine is sufficient to perform testing; and the Mode I component is vanishingly small.
    Keywords: STRUCTURAL MECHANICS
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    Experimental compliance calibration of the compact fracture toughness specimen (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Compliances and stress intensity coefficients were determined over crack length to width ratios from 0.1 to 0.8. Displacements were measured at the load points, load line, and crack mouth. Special fixturing was devised to permit accurate measurement of load point displacement. The results are in agreement with the currently used results of boundary collocation analyses. The errors which occur in stress intensity coefficients or specimen energy input determinations made from load line displacement measurements rather than from load point measurements are emphasized.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-81665 , E-685
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unknown
    Comparison tests and experimental compliance calibration of the proposed standard round compact plane strain fracture toughness specimen (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Standard round specimen fracture test results compared satisfactorily with results from standard rectangular compact specimens machined from the same material. The location of the loading pin holes was found to provide adequate strength in the load bearing region for plane strain fracture toughness testing. Excellent agreement was found between the stress intensity coefficient values obtained from compliance measurements and the analytic solution proposed for inclusion in the standard test method. Load displacement measurements were made using long armed displacement gages and hollow loading cylinders. Gage points registered on the loading hole surfaces through small holes in the walls of the loading cylinders.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-81379 , E-284
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unknown
    Effect of long-time, elevated-temperature exposures to vacuum and lithium on the properties of a tantalum alloy, T-111 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of long-term, elevated-temperature vacuum and lithium exposures on the mechanical properties of T-111 (Ta-8W-2Hf) is determined. Exposure conditions were for 1000 hours at 980 or 1315 C, 5000 hours at 1315 C, and a duplex temperature exposure of 1000 hours at 980 C plus 4000 hours at 1040 C. The exposures resulted in reduced tensile and creep strengths of the T-111 in the 900 to 1100 C temperature range where a dynamic strain-age-strengthening mechanism is operative in this alloy. This strength reduction was attributed to the depletion of oxygen from solid solution in this alloy.
    Keywords: MATERIALS, METALLIC
    Type: NASA-TN-D-7548 , E-7589
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unknown
    Precision scriber (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Device scribes fine lines to precise tolerances on flat or round surfaces. Scriber is used in conjunction with toolmaker's microscope and will scribe metal of nonmetallic surfaces. When not in use, scriber is easily retracted or swung out of way so microscope can be used for other purposes.
    Keywords: FABRICATION TECHNOLOGY
    Type: LEW-12976 , NASA Tech Briefs (ISSN 0145-319X); 4; 4; P. 563
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unknown
    Determining radii of cylindrical segments (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Simple method determines either inside or outside radius of cylindrical segment when full diametrical section of material is not accessible for caliper measurement or if size, condition, or maneuverability of cylinder is not amenable to use of template or comparator-type devices. Method employs standard micrometer or depth gage with ball-end rod and fixed-length baseplate. Method is more adaptable in variety of situations than are existing methods, and measurements can be obtained under conditions that may be difficult if not impossible using other methods.
    Keywords: MECHANICS
    Type: LEW-12826 , NASA Tech Briefs (ISSN 0145-319X); 4; 4; P. 536
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 10
    facet.materialart.
    Unknown
    Improved displacement measurement in bend testing (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Removable spacers extend displacement range and increase accuracy. Innovation is needed to accurately measure displacement between ram and load applicator of compression testing machine during bend testing.
    Keywords: MECHANICS
    Type: LEW-13035 , NASA Tech Briefs (ISSN 0145-319X); 4; 2; P. 250
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...