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Journal Articles
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Efforts to deploy CMC components in demanding propulsion environments are s...
Published Online: April 26, 2024
Fig. 1 Efforts to deploy CMC components in demanding propulsion environments are supported by AE-CMC damage characterization research. ( a ) A coated Si-based CMC under tensile load is subject to temperatures up to 1316 °C in NASA-developed burner rig for simulating engine conditions. Image obtain... More about this image found in Efforts to deploy CMC components in demanding propulsion environments are s...
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CMCs are composed of ceramic fibers, possibly coated with a weak interphase...
Published Online: April 26, 2024
Fig. 2 CMCs are composed of ceramic fibers, possibly coated with a weak interphase depending on the CMC type, embedded in a ceramic matrix. Polished cross section of SiC/SiC CVI matrix minicomposite with boron-nitride (BN) interphase. Figure obtained from Ref. [ 31 ] with permission from Elsevier.... More about this image found in CMCs are composed of ceramic fibers, possibly coated with a weak interphase...
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The interactions of microscale damage mechanisms (i.e., matrix cracking, fi...
Published Online: April 26, 2024
Fig. 3 The interactions of microscale damage mechanisms (i.e., matrix cracking, fiber debonding/sliding/breakage) allow CMCs to exhibit ductile-like behavior, despite being composed of brittle constituents. ( a ) Idealized unidirectional composite geometry that illustrates fundamental CMC damage m... More about this image found in The interactions of microscale damage mechanisms (i.e., matrix cracking, fi...
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In a plate geometry, AE produced by damage takes on the form of plate waves...
Published Online: April 26, 2024
Fig. 4 In a plate geometry, AE produced by damage takes on the form of plate waves, which are composed of an extensional and flexural mode. The out-of-plane displacement u ( x , t ) due to an in-plane dipole source is simulated at varying source heights with respect to the plate midplane ( z  = ... More about this image found in In a plate geometry, AE produced by damage takes on the form of plate waves...
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The radiation pattern of an AE depends on the orientation and fracture mode...
Published Online: April 26, 2024
Fig. 5 The radiation pattern of an AE depends on the orientation and fracture mode of its source, which can be understood through the ( a ) moment tensor representation, i.e., a collection of dipoles or couples. For a pure-shear source ( b ) the polarity of the emitted wavefront depends on the ang... More about this image found in The radiation pattern of an AE depends on the orientation and fracture mode...
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The characteristics of an AE signal depend on its source, the propagation p...
Published Online: April 26, 2024
Fig. 6 The characteristics of an AE signal depend on its source, the propagation pathway from source-to-receiver, and the conversion of surface motion to a digital waveform. The evolution of an AE signal is modeled as a series of linear systems, analyzable in both the time and frequency domains. I... More about this image found in The characteristics of an AE signal depend on its source, the propagation p...
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CMC damage is commonly monitored using the cumulative AE energy or elastic ...
Published Online: April 26, 2024
Fig. 7 CMC damage is commonly monitored using the cumulative AE energy or elastic wave speed. The trends in cumulative AE energy and elastic wave speed are loosely depicted in ( a ). Generally, these S-like curves may be separated into three regimes according to the matrix cracking onset and satur... More about this image found in CMC damage is commonly monitored using the cumulative AE energy or elastic ...
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CMCs damage mechanisms are hypothesized to emit unique AE signals. AEs are ...
Published Online: April 26, 2024
Fig. 8 CMCs damage mechanisms are hypothesized to emit unique AE signals. AEs are emitted by the various damage mechanisms in CMCs (i.e., matrix cracking, fiber breakage, debonding, sliding). The signals obtained during a CMC mechanical test are commonly grouped according to their source damage me... More about this image found in CMCs damage mechanisms are hypothesized to emit unique AE signals. AEs are ...
Journal Articles
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Overview of the autoregressive decoder-only transformer architecture used t...
Published Online: January 10, 2024
Fig. 1 Overview of the autoregressive decoder-only transformer architecture used to construct MechGPT. The decoder-only generative pretrained transformer (GPT) model (see, e.g., Refs. [ 2 ], [ 11 ], [ 13 ], [ 14 ], and [ 55 ] for model architecture and applications in materials modeling) tends to ... More about this image found in Overview of the autoregressive decoder-only transformer architecture used t...
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Overview of the modeling strategy used here, incorporating a PDF of a book ...
Published Online: January 10, 2024
Fig. 2 Overview of the modeling strategy used here, incorporating a PDF of a book [ 32 ], extracting question-and-answer pairs, and using this dataset to fine-tune a LLM to yield MechGPT, which can be used for a variety of downstream tasks including the extraction of ontological knowledge graphs, ... More about this image found in Overview of the modeling strategy used here, incorporating a PDF of a book ...
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Schematic of the workflow. Panel  a  shows details of a call to the LLM, fe...
Published Online: January 10, 2024
Fig. 3 Schematic of the workflow. Panel a shows details of a call to the LLM, featuring a system prompt, context/background to the query, additional details, and other information, typically followed by a question or task (the query can take many different forms, as the examples presented in thi... More about this image found in Schematic of the workflow. Panel a shows details of a call to the LLM, fe...
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A screenshot of the MechGPT chat application app. Movies of interactions wi...
Published Online: January 10, 2024
Fig. 4 A screenshot of the MechGPT chat application app. Movies of interactions with the model are shown via Supplemental Movies M1 and M2 available in the Supplemental Materials on the ASME Digital Collection. The app features three main parts, the main chat window (top), and two optional secti... More about this image found in A screenshot of the MechGPT chat application app. Movies of interactions wi...
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Application of few-shot learning to predict grain size-dependent flow stres...
Published Online: January 10, 2024
Fig. 5 Application of few-shot learning to predict grain size-dependent flow stress in copper, as obtained via large-scale MD simulations (original data from Ref. [ 36 ]). The predictions generally agree well and showcase the potential of the model to be applied to quantitative assessments of mate... More about this image found in Application of few-shot learning to predict grain size-dependent flow stres...
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Development of ontological knowledge graph representation to relate hyperel...
Published Online: January 10, 2024
Fig. 6 Development of ontological knowledge graph representation to relate hyperelasticity in the context of supersonic fracture and protein unfolding mechanisms. In this example we apply the method to the query listed in Table 5 , to explore connections across different areas of mechanics and ... More about this image found in Development of ontological knowledge graph representation to relate hyperel...
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Development of ontological knowledge graph representation for relating disl...
Published Online: January 10, 2024
Fig. 7 Development of ontological knowledge graph representation for relating dislocations in a ductile material and music, especially discussing the concept of counterpoint. We use the same process as defined in Fig. 6( a ) , to first generate a corpus of text that is then analyzed to form an on... More about this image found in Development of ontological knowledge graph representation for relating disl...
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Using graph-based strategies we can use an LLM to develop graph representat...
Published Online: January 10, 2024
Fig. 8 Using graph-based strategies we can use an LLM to develop graph representation of knowledge in an ontological knowledge graph, here exemplified for the nanogut paper also investigated in Table 7 . By using the OCR model Nougat [ 40 ] we can ingest a PDF file and convert it accurately into ... More about this image found in Using graph-based strategies we can use an LLM to develop graph representat...
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Using graph-based strategies we can use an LLM to develop graph representat...
Published Online: January 10, 2024
Fig. 8 Using graph-based strategies we can use an LLM to develop graph representation of knowledge in an ontological knowledge graph, here exemplified for the nanogut paper also investigated in Table 7 . By using the OCR model Nougat [ 40 ] we can ingest a PDF file and convert it accurately into ... More about this image found in Using graph-based strategies we can use an LLM to develop graph representat...